# Components:
→ Sponge Cake
01 - 3 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 cup 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
# Directions:
01 - Preheat the oven to 350°F. Grease and line five 8 x 8 inch square baking pans, or plan to bake in batches if pans are limited.
02 - In a large bowl, beat the softened butter and granulated sugar together until light and fluffy. Add eggs one at a time, mixing well after each addition, then stir in the vanilla extract.
03 - In a separate bowl, whisk together the all-purpose flour, baking powder, and salt until evenly blended.
04 - Alternately add the dry mixture and milk to the butter and egg mixture, starting and ending with the dry ingredients. Stir gently until just combined to avoid overmixing.
05 - Divide the batter evenly into five separate bowls. Tint each portion with a different food coloring gel to achieve vibrant hues.
06 - Pour each colored batter into the prepared pans and smooth the surfaces. Bake for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean.
07 - Allow the cakes to cool in the pans for 10 minutes, then invert onto wire racks to cool completely.
08 - Using an electric mixer, beat the softened butter until creamy. Gradually add powdered sugar, vanilla extract, and salt, mixing until fluffy. Adjust consistency by adding milk one tablespoon at a time.
09 - Trim the edges of each sponge layer, then slice into uniform 1 inch square pieces.
10 - Arrange squares on a large tray in an alternating color pattern to create a patchwork effect. Use a thin layer of buttercream between squares to adhere them together. Build up layers, continuing the alternating color pattern for a quilted appearance.
11 - Apply a thin coat of buttercream over the entire cake, smoothing the sides and top. Optionally, pipe additional buttercream lines to accentuate the patchwork design.
12 - Refrigerate the cake for 30 minutes prior to slicing to ensure clean cuts and serve chilled.