Easy Six-Layer Rainbow Cake: A Stunning and Colourful Celebration
Easy Six-Layer Rainbow Cake is a colorful vanilla layer cake featuring six vibrant rainbow-colored layers stacked with creamy buttercream frosting. Perfect for birthdays, parties, and special occasions, this cake combines a moist, fluffy texture with rich vanilla flavor. Its stunning rainbow interior creates a dramatic surprise when sliced. Despite its bakery-style appearance, the recipe is beginner-friendly and easy to follow. Every slice delivers a delightful combination of sweetness, color, and celebration.
Ingredients
For the Cake
- 3 cups all-purpose flour
- 2½ teaspoons baking powder
- ½ teaspoon salt
- 1 cup unsalted butter, softened
- 2 cups granulated sugar
- 5 large egg whites
- 1 tablespoon vanilla extract
- 1½ cups whole milk
- Gel food coloring: red, orange, yellow, green, blue, and purple
For the Buttercream Frosting
- 2 cups unsalted butter, softened
- 6 cups powdered sugar
- 4 tablespoons heavy cream
- 2 teaspoons vanilla extract
- Pinch of salt
Instructions
- Preheat oven to 350°F (175°C).Grease and line six 8-inch round cake pans with parchment paper.
- In a medium bowl, whisk together flour, baking powder, and salt.In a large bowl.
- Divide the batter evenly among six bowls.
- Tint each bowl with one of the rainbow colors:
- beat butter and sugar until light and fluffy.
- Add egg whites one at a time, mixing well after each addition.Mix in vanilla extract.
- Alternately add dry ingredients and milk until fully combined.
- Pour each colored batter into a prepared cake pan.
- Bake for 15–18 minutes or until a toothpick inserted in the center comes out clean.Allow layers to cool completely.
- Place the purple layer on a cake stand.Spread a thin layer of frosting.
- Slice carefully to reveal the beautiful rainbow layers and enjoy.
Notes
- Gel food coloring produces brighter colors than liquid coloring.
- Measure batter evenly for uniform layers.
- Cool layers completely before frosting.
- Use a cake turntable for easier decorating.
- Refrigerate briefly if layers become too soft.
- Trim cake tops for perfectly even stacking.
- Store leftovers in an airtight container.
- Allow refrigerated cake to reach room temperature before serving.