# What You'll Need:
→ Sponge Cake
01 - 2 3/4 cups all-purpose flour
02 - 1 1/2 cups granulated sugar
03 - 2 1/2 teaspoons baking powder
04 - 1/2 teaspoon salt
05 - 1 1/8 cups unsalted butter, softened
06 - 4 large eggs
07 - 1 cup whole milk
08 - 2 teaspoons vanilla extract
09 - Food coloring gels (red, yellow, green, blue, purple)
→ Buttercream Frosting
10 - 1 1/2 cups unsalted butter, softened
11 - 4 cups powdered sugar
12 - 3 to 4 tablespoons milk
13 - 2 teaspoons vanilla extract
14 - Pinch of salt
# How To Make It:
01 - Preheat the oven to 350°F. Grease and line five 8 x 8 inch square baking pans, or prepare to bake in batches if necessary.
02 - In a large bowl, beat the butter and sugar together until light and fluffy. Add the eggs one at a time, mixing well after each addition, then incorporate the vanilla extract.
03 - In a separate bowl, whisk together the flour, baking powder, and salt.
04 - Alternately add the flour mixture and milk to the butter mixture, beginning and ending with the flour mixture. Stir until just combined.
05 - Divide the batter evenly among five bowls. Tint each portion with a different food coloring gel.
06 - Pour each colored batter into the prepared pans and spread evenly. Bake for 20 to 25 minutes or until a toothpick inserted comes out clean.
07 - Allow the cakes to cool in their pans for 10 minutes before transferring to wire racks to cool completely.
08 - Beat the butter until creamy. Gradually add the powdered sugar, vanilla, and salt, beating until fluffy. Add milk as needed to achieve desired consistency.
09 - Trim the edges of the cooled cakes and cut each colored sponge into uniform 1¼ x 1¼ inch squares.
10 - Arrange the sponge squares on a large tray in alternating colors to create a patchwork appearance. Use a thin layer of buttercream between squares to bind them. Stack layers, alternating colors to achieve a quilted effect.
11 - Coat the top and sides of the assembled cake with a thin, even layer of buttercream, smoothing the surface. Optionally, pipe buttercream lines to accentuate the patchwork design.
12 - Refrigerate the cake for 30 minutes to set before slicing and serving.