Ina Garten Flag Cake Recipe (2026): Foolproof & Easy

I’m going to be honest. A “flag cake” sounds like one of those projects that looks adorable on Pinterest and then quietly ruins your afternoon.

Except this one does not have to.

Ina Garten’s whole vibe is calm, sensible, and quietly genius, and that’s the energy we’re bringing to a flag cake in 2026. Simple sheet cake. Creamy frosting. Berries. No weird gadgets. No fondant. No tears. And if you’re feeding a crowd, it’s the kind of dessert that disappears fast, like you blink and the corner pieces are already gone.

This is my go to, foolproof, easy version, inspired by Ina’s classic approach to butter cake and cream cheese frosting, plus a clean method for getting the “flag” look without stressing about perfect geometry. It’s still a showstopper. It just doesn’t punish you for being human.

What this cake actually is
A flag cake is basically:

A tender vanilla sheet cake (think classic birthday cake but a little more grown up).
A thick layer of tangy sweet frosting.
Strawberries and blueberries arranged like the American flag.
That’s it.

And when it’s done right, it’s not just cute. It’s genuinely good cake. Buttery, moist, not dry. Frosting that tastes like something you’d eat with a spoon. Berries that make it feel fresh, not heavy.

Why this is “Ina Garten style” (even if you tweak it)
Ina’s recipes work because they’re structured. They’re not fussy, but they’re deliberate.

So the “Ina-ish” rules here are:

Use good butter. Unsalted. Room temp.
Don’t skimp on vanilla.
Don’t overbake the cake.
Frosting should be thick enough to hold berries without sliding around.
Make it ahead friendly, because you have better things to do on a holiday.
Also, and this matters, a sheet cake is easier than a layer cake. More forgiving. Slices better. Travels better. Serves more people without drama.

Equipment (keep it basic)
You do not need special tools. Here’s what helps:

1 standard 9×13 inch baking pan (metal is best)
Parchment paper (optional but makes life easier)
Stand mixer or hand mixer
Rubber spatula
Offset spatula for frosting (nice, not required)
Measuring cups and spoons
Cooling rack (also nice, not required)
If you have a kitchen scale, great. But this recipe is written to work with normal measuring cups because that’s how most people actually bake.

Ingredients
For the vanilla sheet cake
2 1/2 cups all purpose flour
2 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1 teaspoon kosher salt (or 3/4 teaspoon fine salt)
1 cup unsalted butter, room temperature (2 sticks)
1 3/4 cups granulated sugar
4 large eggs, room temperature
1 tablespoon pure vanilla extract
1 cup buttermilk, room temperature
If you don’t have buttermilk: use 1 cup milk plus 1 tablespoon lemon juice or vinegar, stir, wait 5 to 10 minutes.
Optional but very Ina: 1 teaspoon almond extract. It makes the cake taste like a bakery cake. Not necessary, but it’s a nice little secret.

For the cream cheese frosting
12 ounces cream cheese, room temperature (1 1/2 blocks)
3/4 cup unsalted butter, room temperature (1 1/2 sticks)
1 tablespoon pure vanilla extract
Pinch of salt
4 to 4 1/2 cups powdered sugar, sifted if lumpy
1 to 2 tablespoons heavy cream or milk, only if needed for texture
This makes enough frosting for a generous layer. If you like a thinner coat, you’ll have a bit extra. I never consider extra frosting a problem.

For the “flag” topping
2 pints fresh blueberries (you may not use all)
2 to 3 pints fresh strawberries
Optional: 1 pint raspberries if you want a looser, more rustic red stripe situation
You want berries that look good, yes. But you also want berries that taste good. If the strawberries are white inside and sour, your cake will be pretty and disappointing. Try to get ripe ones.

Before you start, read this part (it saves you later)
Bring the butter, eggs, cream cheese, and buttermilk to room temperature.
This is not a “maybe.” Cold ingredients make a lumpy batter and weird frosting.
Don’t wash berries until you’re ready to decorate, or dry them extremely well.
Water makes the frosting weep and the berries slide around.
This cake is best assembled the day you serve it, but you can bake the cake a day ahead.
Ok. Let’s bake.

Step by step: the foolproof cake

1. Prep the pan and oven
   Heat oven to 350°F (175°C).

Grease a 9×13 inch pan with butter or baking spray. For extra insurance, line the bottom with parchment paper and grease that too.

Why I like parchment here. If the cake sticks even a little, you’ll fight it, and then you’re already annoyed. Parchment keeps the mood pleasant.

2. Mix the dry ingredients
   In a medium bowl, whisk:

flour
baking powder
baking soda
salt
Set aside.

3. Cream butter and sugar
   In a stand mixer with paddle attachment, or a big bowl with a hand mixer:

Beat butter and sugar on medium high for about 3 minutes, until it looks lighter and fluffy.

It should not look like wet sand. It should look like it belongs in a cake.

4. Add eggs and vanilla
   Add eggs one at a time, beating after each addition. Scrape down the bowl once or twice.

Add vanilla (and almond extract if using). Mix just to combine.

5. Add dry ingredients and buttermilk, alternating
   Turn mixer to low.

Add flour mixture in three additions, alternating with buttermilk in two additions. So it’s like:

flour
buttermilk
flour
buttermilk
flour
Mix until just combined. Stop before it’s perfectly smooth and finish with a spatula.

Overmixing makes a cake tougher. Not terrible. Just not the soft, plush vibe we want.

6. Bake
   Pour batter into pan and smooth the top.

Bake 28 to 35 minutes. Start checking at 28.

It’s done when:

the top is lightly golden
a toothpick in the center comes out clean or with a few moist crumbs
the cake springs back when you lightly press the center
Do not wait until it’s dark brown. A dry flag cake is a crime.

7. Cool completely
   Cool in the pan for 15 minutes, then cool completely.

You can frost in the pan. That’s the easiest way. You can also lift it out if you used parchment, but honestly, frosting in the pan is calmer. It’s a sheet cake. Let it be a sheet cake.

Cream cheese frosting that actually behaves
Cream cheese frosting can get runny if you beat it too much or if your cream cheese is too soft. This version is thick and spreadable, and it holds berries.

1. Beat butter and cream cheese
   Beat the butter first for 1 minute. Then add cream cheese and beat just until smooth.

Key word: just. Don’t whip it for five minutes like it’s buttercream.

2. Add vanilla and salt
   Mix in vanilla and a pinch of salt.
3. Add powdered sugar
   Add powdered sugar gradually, mixing on low at first so you don’t create a sugar cloud that coats your kitchen.

Once incorporated, beat on medium for maybe 20 to 30 seconds until smooth.

If it feels too thick to spread, add 1 tablespoon cream or milk. If it’s too soft, add more powdered sugar. You want it thick enough that a berry placed on top does not sink.

4. Chill briefly if your kitchen is warm
   If it’s hot out, like full July heat and your AC is struggling, chill the frosting for 15 minutes before spreading.

Not hours. Just a little reset.

Assemble the cake (the easy way)

1. Frost the cooled cake
   Spread frosting evenly over the cake.

You don’t need fancy swoops. A smooth, flat surface actually makes berry placement easier.

2. Make the “blue” corner first
   In the top left corner, create a rectangle of blueberries. This is the canton, the blue part of the flag.

A good guideline for a 9×13 cake:

about 4 inches wide
about 5 inches tall
No ruler required. Eyeballing it is fine.

Place blueberries close together, like little tiles. They look best when they touch.

3. Add strawberry “stripes”
   Slice strawberries thin, lengthwise. Pat them dry with paper towels.

Now make stripes across the cake horizontally, starting at the top and working down.

Let the berry stripes run behind the blueberry corner too, or stop the stripes at the edge of the blueberry block. Either looks fine. If you want the most “flag like” look, stop the stripes where the blueberries begin, and resume on the right side.

You’re going for the vibe, not a government issued textile replica.

If your strawberries are small, you may overlap them like shingles. If they’re big, one row per stripe is enough.

4. Fix the little gaps
   Step back and look at it. There will be weird gaps. There always are.

Just tuck in more berries.

Blueberries fix everything, by the way. They’re like edible spackle.

Make it ahead (because you should enjoy the day)
Here’s the realistic timeline.

Option 1: Bake the cake the day before, decorate the day of
This is the best balance.

Bake cake, cool completely.
Cover pan tightly with plastic wrap or foil.
Store at room temp overnight (cool room) or in fridge if your kitchen is warm.
Make frosting and decorate the next day.
If you refrigerate the cake, let it sit at room temp 30 to 45 minutes before frosting so the frosting spreads easily.

Option 2: Fully assemble a few hours ahead
Also totally fine.

Assemble up to 6 hours before serving, refrigerate loosely covered. Bring to room temp 30 minutes before serving.

The longer it sits, the more the berries can weep a little. Still good. Just slightly messier.

Option 3: Fully assemble the night before
You can. I do it sometimes. But know what happens:

The berries soften.
You may get a little red juice bleeding into the frosting.
If you want to do it anyway, here’s how to reduce that:

Dry berries very well.
Add berries right before bed, not at 3 pm.
Refrigerate uncovered for 30 minutes to “set” the frosting, then cover gently.
Serving and slicing (this is where people mess it up)
Use a sharp knife. Wipe it between cuts.

If you want clean slices that show off the design, chill the cake 20 minutes before slicing. Cold frosting cuts cleaner.

If you do not care about perfect slices because you are normal, slice it at room temp and move on.

A 9×13 cake usually serves:

12 generous pieces
15 medium pieces
20 smaller party pieces
And there’s always that one person who wants the blueberry corner. You can either be strategic or let fate decide.

Troubleshooting (so you don’t panic)
My cake looks dry
Most likely overbaked. Next time start checking earlier.

If it’s already baked and you’re stuck with it, you can brush the cake with a simple syrup (equal parts sugar and water, warmed until dissolved, cooled). You don’t need to soak it. Just a light brush.

My frosting is runny
A few causes:

Cream cheese too soft or beaten too long.
Kitchen too warm.
Not enough powdered sugar.
Fix: Chill frosting 20 minutes, then beat in more powdered sugar a little at a time. Also, stop mixing once smooth.

My strawberries are bleeding into the frosting
They were wet, or the cake sat too long assembled.

Fix: Pat berries dry. Assemble closer to serving time.

My blueberries roll everywhere
That’s normal. Herd them into place. If the frosting is too soft, chill the frosted cake 15 minutes before adding berries.

My flag design looks weird
It’s berries on cake. It will be charming even if it’s not symmetrical.

And honestly, once it’s cut, nobody will remember the stripes. They will remember if it tasted good. Focus there.

Flavor upgrades (still easy, still Ina-ish)
If you want to make it a tiny bit more special, without turning it into a “project,” here are upgrades that work.

1. Add lemon zest to the cake
   Add 1 to 2 teaspoons lemon zest to the sugar before creaming with butter. Rub it in with your fingers first. The smell alone is worth it.

Alternatively, you could consider using a lemon cream cheese frosting or a lemon cream cheese frosting recipe that integrates this flavor directly into your frosting for an added twist.

2. Add a thin layer of jam under the frosting
   A very thin layer of strawberry jam or raspberry jam brushed over the cooled cake adds flavor and helps keep it moist. Then frost on top.

Don’t use a thick layer. It will slide.

3. Swap to mascarpone frosting
   If you want a more luxurious frosting that’s less tangy, do half cream cheese and half mascarpone. Keep the powdered sugar similar.

It tastes like a fancy bakery. Still stable.

4. Use a vanilla bean paste
   Instead of extract, use 2 teaspoons vanilla bean paste. You’ll get those little specks. People love that.

Ingredient notes (because 2026 grocery stores are chaos)
Butter
Use unsalted. If you only have salted butter, reduce added salt to a small pinch.

Flour
All purpose flour is right here. Cake flour makes it softer but you’ll lose a bit of structure. For a flag cake that gets carried outside and served on paper plates, structure is good.

Cream cheese
Full fat brick style cream cheese. Not whipped, not spreadable in a tub.

Berries
Fresh is best. Frozen berries will leak everywhere as they thaw. Please do not.

A quick “Ina” checklist before you bring it out
Cake is fully cooled before frosting.
Frosting is thick, not glossy and loose.
Berries are dry.
You left yourself time to decorate without rushing.
You tasted one strawberry. It’s sweet. Good.
Ok. Bring it out. People will do that thing where they say “oh wow” and then immediately ask who wants a piece.

The full recipe (print friendly)
Ina Garten style Flag Cake (9×13)
Cake
Ingredients

2 1/2 cups all purpose flour
2 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1 teaspoon kosher salt
1 cup unsalted butter, room temperature
1 3/4 cups granulated sugar
4 large eggs, room temperature
1 tablespoon pure vanilla extract
1 cup buttermilk, room temperature
Optional: 1 teaspoon almond extract
Instructions

Heat oven to 350°F. Grease a 9×13 pan. Optional parchment on bottom.
Whisk flour, baking powder, baking soda, and salt.
Cream butter and sugar until light and fluffy, about 3 minutes.
Add eggs one at a time. Add vanilla (and almond extract if using).
Add dry ingredients and buttermilk alternating, mixing just until combined.
Bake 28 to 35 minutes, until a toothpick comes out clean.
Cool completely.
Frosting
Ingredients

12 ounces cream cheese, room temperature
3/4 cup unsalted butter, room temperature
1 tablespoon vanilla extract
Pinch of salt
4 to 4 1/2 cups powdered sugar
1 to 2 tablespoons cream or milk, if needed
Instructions

Beat butter 1 minute. Add cream cheese and beat just until smooth.
Add vanilla and salt.
Mix in powdered sugar gradually. Beat briefly until smooth.
Chill 15 minutes if needed for thickness.
Decorate
Ingredients

2 pints blueberries
2 to 3 pints strawberries, sliced and patted dry
Instructions

Spread frosting evenly over cooled cake.
Create a blueberry rectangle in the top left corner.
Arrange strawberry slices into stripes across the cake.
Let’s wrap this up
If you want a dessert that screams “holiday” without requiring expert pastry skills, this is it. A soft vanilla sheet cake, thick cream cheese frosting, and berries. Simple ingredients, very forgiving, and it looks like you tried really hard even if you did not.

Which, honestly, is kind of the dream.

If you want, tell me how many people you’re serving and whether you want a 9×13, a half sheet, or cupcakes. I can adjust the ingredient amounts so you don’t have to do math while you’re already juggling a million things.

FAQs (Frequently Asked Questions)
What is a flag cake and what makes Ina Garten’s version special?
A flag cake is a tender vanilla sheet cake topped with creamy frosting and fresh berries arranged like the American flag. Ina Garten’s version is simple, foolproof, and inspired by her classic butter cake and cream cheese frosting approach, focusing on calm, sensible techniques without complicated gadgets or fondant.

What ingredients are needed for Ina Garten style vanilla sheet cake?
You will need all-purpose flour, baking powder, baking soda, kosher salt, unsalted butter (room temperature), granulated sugar, large eggs (room temperature), pure vanilla extract, buttermilk (or milk plus lemon juice/vinegar as a substitute), and optionally almond extract for a bakery-like flavor.

How do I make the perfect cream cheese frosting for the flag cake?
Use 12 ounces of room temperature cream cheese, 3/4 cup unsalted butter at room temperature, pure vanilla extract, a pinch of salt, 4 to 4 1/2 cups powdered sugar (sifted if lumpy), and 1 to 2 tablespoons of heavy cream or milk if needed to adjust texture. The frosting should be thick enough to hold berries without sliding.

What equipment do I need to bake Ina Garten’s flag cake?
Basic kitchen tools suffice: a standard 9×13 inch metal baking pan (parchment paper optional but helpful), stand mixer or hand mixer, rubber spatula, offset spatula for frosting (nice to have), measuring cups and spoons, and optionally a cooling rack and kitchen scale.

How should I prepare and handle ingredients before baking the flag cake?
Bring butter, eggs, cream cheese, and buttermilk to room temperature to avoid lumpy batter or frosting. Do not wash berries until ready to decorate; if washed earlier, dry them thoroughly to prevent frosting from weeping or berries sliding off. Bake the cake a day ahead if desired but assemble on the day you serve.

Why is a sheet cake recommended over a layer cake for this flag design?
A sheet cake is easier to bake and frost than a layer cake. It’s more forgiving with slicing, travels better without drama, serves more people efficiently, and suits the simple yet showstopping American flag berry arrangement without stress over perfect geometry.