Picture a tender vanilla sheet cake with a cloud of lightly sweetened whipped cream frosting, crowned with juicy red strawberries and plump blueberries in the shape of an American flag. Every bite is soft, creamy and bright with fresh berry flavor, and the cake smells like warm vanilla and butter the moment it comes out of the oven.
This Memorial Day flag cake is made for backyard barbecues, picnics, parades and any summer holiday potluck where you need a showstopper that feeds a crowd. It bakes in one pan, the frosting comes together in minutes, and you can bake the cake a day ahead so the party day is stress free.
SaveI still remember my aunt arriving at our family cookout every Memorial Day weekend with a flag cake balanced on her lap in the car, berries gleaming under the sun. The kids always crowded around it before the burgers were even off the grill, and now I get to carry that tradition forward with my own version.
Memorial Day Flag Cake
Ingredients
Vanilla Sheet Cake
Whipped Cream Frosting
Flag Decoration
Instructions
- Prep the Pan and Oven
Heat your oven to 350°F. Grease a 9x13 inch baking pan with butter or baking spray, line the bottom with parchment paper and leave a little overhang on the long sides so you can lift the cake out easily later.
- Mix the Dry Ingredients
In a medium bowl, whisk together the flour, baking powder and salt until evenly combined. Set the bowl aside so it is ready when the butter mixture is fluffy.
- Cream the Butter and Sugar
In a large bowl, beat the softened butter and granulated sugar with an electric mixer on medium-high speed for 3 to 4 minutes, until pale, light and fluffy. Scrape down the sides of the bowl once or twice so everything blends evenly.
- Add the Eggs and Vanilla
Beat in the eggs one at a time, mixing well after each addition. Stir in the tablespoon of vanilla extract and mix just until the batter looks smooth and glossy.
- Combine Wet and Dry
Add the flour mixture in three parts, alternating with the milk, beginning and ending with the flour. Mix on low speed just until no dry streaks remain, since overmixing can make the cake tough.
- Bake the Cake
Spread the batter evenly in the prepared pan and smooth the top with a spatula. Bake for 28 to 32 minutes, until the top is golden and a toothpick inserted into the center comes out clean or with a few dry crumbs.
- Cool Completely
Let the cake rest in the pan for 15 minutes, then use the parchment overhang to lift it onto a wire rack. Cool for at least 1 hour until it is fully room temperature, because a warm cake will melt the frosting.
- Whip the Frosting
Beat the softened cream cheese and powdered sugar in a large bowl until smooth with no lumps. Add the vanilla and slowly pour in the cold heavy cream, then beat on medium-high speed for 2 to 3 minutes until stiff peaks form. Stop as soon as the frosting holds its shape so it does not turn grainy.
- Frost the Cake
Transfer the cooled cake to a serving platter or leave it on its parchment. Spread the whipped frosting over the top in a smooth, even layer all the way to the edges, then chill the cake for 30 minutes so the frosting firms up slightly.
- Make the Flag
Press the blueberries closely together in a rectangle in the top left corner, covering about one third of the width and the top half of the cake. Arrange the sliced strawberries in horizontal rows to form the red stripes, leaving a thin gap of white frosting between each row, and continue the stripes beneath the blueberry square to the far edge.
- Chill and Serve
Refrigerate the finished cake for at least 1 hour before slicing so the frosting sets and the berries stay in place. Cut into 15 squares with a sharp knife, wiping the blade clean between slices for tidy edges.
Substitutions and variations
- Use raspberries instead of strawberries for the red stripes if you prefer a slightly tart bite.
- Swap the cream cheese frosting for 8 ounces of thawed whipped topping if you want a lighter, quicker topping, though it will not be as rich.
- A boxed white or yellow cake mix baked in a 9x13 inch pan works in a pinch, so you can skip straight to the frosting and berries.
- Replace the milk with buttermilk for a slightly tangier, extra tender cake crumb.
Chloe's tips
- Use cold heavy cream and a chilled bowl for the fluffiest frosting that holds up in warm weather.
- Pat the berries dry with a paper towel after washing, because extra moisture can make the frosting weep and the colors bleed.
- Lay the strawberry slices cut side down for the neatest stripes and the brightest red color.
- Add the berries within a few hours of serving for the freshest look, especially on a hot outdoor buffet table.
- Use a ruler or the edge of a card to mark your stripes lightly in the frosting before placing the fruit for perfectly straight lines.
How to store it
- Cover the decorated cake loosely and refrigerate for up to 2 days, though the berries look best on the first day.
- Store any leftover slices in an airtight container in the refrigerator for up to 3 days.
- Bake the unfrosted cake up to 1 day ahead, wrap it tightly and keep it at room temperature until you are ready to frost.
- Freeze the unfrosted cake layer wrapped in plastic and foil for up to 2 months, then thaw overnight in the refrigerator.
Serving suggestions
Serve this flag cake chilled alongside your favorite summer cookout dishes.
- With a scoop of vanilla ice cream on the side
- Next to grilled burgers, hot dogs and corn on the cob
- With iced tea or fresh lemonade
- Alongside a bowl of extra mixed berries for sharing
Frequently asked questions
Can I make Memorial Day flag cake ahead of time?
Yes. Bake the cake one day ahead and keep it wrapped at room temperature, then frost and decorate it on the morning of your party. Chill it until serving time.
Can I use frozen berries on the flag cake?
Fresh berries are best because frozen ones release a lot of juice as they thaw and will stain the frosting. If you must use frozen, thaw them completely and pat them very dry first.
How do I keep the whipped cream frosting from melting outdoors?
The cream cheese in this frosting helps it stay stable, but keep the cake refrigerated until the moment you serve it and keep it in the shade. Set it over a tray of ice if it will sit out for a while.
Can I bake this in a different size pan?
A 10x15 inch jelly roll pan works nicely for a thinner cake; reduce the baking time to 20 to 24 minutes. A 9x13 inch pan gives you taller, fluffier slices.
Let's get cooking!
Whether you are heading to a neighborhood picnic or hosting the whole family at home, this Memorial Day flag cake is a sweet way to honor the holiday and bring everyone together. Bake it, decorate it with love and enjoy every berry-topped bite with the people who matter most.
