25-Minute Rainbow Layer Cake
Stack store-bought pound cake slices with vibrant gel food coloring and whipped buttercream for an Instagram-worthy rainbow cake in under 30 minutes. No baking required—just color, frost, and serve.
- Total time
- 25 min
- Servings
- 8
- Calories
- 520
- Protein
- 3g
Ingredients
- 2 loaves (thawed if frozen) store-bought pound cake
- 1 cup unsalted butter, softened
- 3 cups powdered sugar
- 6 small bottles gel food coloring (red, orange, yellow, green, blue, purple)
- 3 tbsp heavy cream
- 1 tsp vanilla extract
- ½ cup sprinkles or pearl sugar (optional garnish)
Instructions
- 1
Beat softened butter and powdered sugar until pale and fluffy, about 2 minutes.
- 2
Add cream and vanilla, then beat until smooth. Divide frosting into 6 bowls.
- 3
Add one gel color to each bowl, stirring until evenly tinted. Start with 2-3 drops per color.
- 4
Slice pound cake into 12 thin layers (about 1/4-inch thick) using a serrated knife.
- 5
Layer cakes on a plate or cake stand: spread 1 tbsp colored frosting between each layer, rotating colors (red, orange, yellow, green, blue, purple).
- 6
Frost the outside with any remaining buttercream, then top with sprinkles if desired. Serve immediately or chill up to 2 hours.
Tools you’ll need
- electric mixer or whisk
- 6 small bowls
- serrated bread knife
- offset spatula or butter knife
- cake plate or stand
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