Rainbow Layer Cake

5 from 1 vote

This rainbow cake is a fun and colorful dessert with vibrant layers and fluffy frosting. Perfect for birthdays and celebrations!

Prep Time30

Cook Time1

Total Time2

Course: Dessert

Cuisine: American

Keyword: cake, cake recipe, rainbow cake

Servings: servings

Calories: 433kcal

Preheat the oven to the temperature on the back of the cake box. Prepare and grease the cake pans. Set aside.
In a large bowl, combine the cake mix, water, vegetable oil, sour cream, and eggs. Mix well to combine.
Evenly distribute the batter into six bowls to make all of the colors. Add the desired amount of food coloring to each bowl and mix until the color is smooth.
Add the batter to the pan for each color and bake according to the package on the back of the cake mix box.
Let the cake cool completely before frosting the cake with buttercream frosting. Frost the cake, first with a crumb coat, and then with the remaining frosting. Top with sprinkles if desired.

Use gel food coloring: It creates brighter, more vibrant layers without thinning the batter.

Measure evenly: Divide the batter as evenly as possible for uniform layers.

Let cakes cool completely: This prevents the frosting from melting and sliding.

Level your layers: Trim the tops if needed so the cake stacks evenly.

Chill before final frosting: This helps create a smooth, professional finish.