Celebrate patriotic holidays with this festive USA Flag Vanilla Sheet Cake, featuring a soft, moist vanilla cake topped with creamy homemade frosting and fresh berries arranged in a classic American flag design. Perfect for the Fourth of July, Memorial Day, Labor Day, and summer gatherings, this easy vanilla sheet cake recipe is a crowd-pleasing dessert that’s as beautiful as it is delicious.

Can I make a USA Flag Vanilla Sheet Cake ahead of time?

Yes. You can bake the vanilla sheet cake 1 to 2 days in advance and frost and decorate it with fresh berries on the day you plan to serve it for the freshest appearance.

What size pan is best for a flag cake?

A 9×13-inch sheet pan is the most popular choice because it provides the perfect surface for creating the American flag design with frosting and berries.

Which fruit is best for decorating a flag cake?

Fresh blueberries are ideal for the stars section, while sliced strawberries or raspberries create vibrant red stripes. Fresh fruit gives the cake its classic patriotic look.

How do I keep the berries from making the frosting watery?

Wash and thoroughly dry the berries before decorating. Pat them dry with paper towels to prevent excess moisture from affecting the frosting.

What type of frosting works best for a flag cake?

Buttercream frosting is the most popular choice because it’s sturdy, easy to spread, and holds the fruit decorations in place. Cream cheese frosting is another delicious option.

Cook with me!

USA Flag Vanilla Sheet Cake

5 from 1 vote

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Prep Time30

Cook Time25

Resting time2

Total Time2 55

Ingredients

For the vanilla sheet cake:

3 cups cake flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon fine sea salt
1 cup granulated cane sugar
1/2 cup softened unsalted butter
1/3 cup olive oil or avocado oil
3 large eggs
3/4 cup buttermilk
1/2 cup sour cream
1 tablespoon vanilla extract
1/4 teaspoon almond extract

For the vanilla buttercream:

8 ounces softened cream cheese
1/2 cup softened unsalted butter
4 to 5 cups powdered sugar
1 to 2 tablespoons heavy cream
1 tablespoon vanilla extract
1/2 teaspoon fine sea salt

For decorating:

12 to 14 oz fresh raspberries washed and dried
1 pint fresh blueberries washed and dried

Instructions

To make the vanilla sheet cake:

Preheat oven to 350F. Butter and line with parchment paper a 9×13″ baking pan.
In a bowl, whisk together the cake flour, baking powder, baking soda, and salt. Set aside.
In the bowl of a stand mixer fitted with the whisk attachment, combine the sugar, softened butter, and olive oil. Mix on LOW speed until incorporated then beat on HIGH speed for 2 to 3 minutes, until very light and fluffy.
On Medium speed, add the eggs one at a time until incorporated. Beat 2 more minutes.
Add the buttermilk, sour cream, vanilla, and almond extract. Mix until smooth, but it’s okay if it looks curdle-like.
Add the flour mixture and mix just until combined. Use a rubber spatula to help finish folding in the flour to prevent any over mixing (which causes dense cake).
Transfer the cake batter to the prepared pan. Evenly spread out the top with a rubber spatula.
Bake on the middle rack for 25 to 30 minutes, until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
Let cool in the pan for 20 minutes then transfer to a wire rack to cool completely.

To make the buttercream:

Combine the softened cream cheese and butter in the bowl of a stand mixer fitted with the paddle attachment. Beat for 2 to 3 minutes, until very smooth and light.
Add the powdered sugar 1 cup at a time. Once incorporated, add a splash of heavy cream at a time to help loosen up and fluff up the buttercream. Add the vanilla and salt. Beat for 3 to 4 minutes, until light and fluffy.

To decorate:

Add a thin layer of frosting around the top and sides of the sheet cake. You are creating a blank canvas for your design!
Add the blueberries in a square at the upper lefthand corner. Transfer a small amount of frosting to a piping bag with a small star tip. Pipe small star mounds in between the blueberries.
Alternate between layers of raspberries and buttercream (in a larger star tip piping bag) for the red and white stripes.
Keep away from direct heat and sunlight prior to serving. Best decorated day of serving.

I truly hope you all enjoy this treasured recipe that has nestled its way into our hearts here in the ABM kitchen! ’till next time… xxL

“For I know the plans I have for you,” declares the Lord, “plans to prosper you and not to harm you, plans to give you hope and a future.” ~ Jeremiah 29:11 NIV

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