Lets Celebrate! How To Bake A Rainbow Sprinkle Cake From Scratch

Lets Celebrate! How To Bake A Rainbow Sprinkle Cake From Scratch

For A Girl in LA’s one year anniversary, I wanted to do something special to commemorate the milestone. I decided to create a rainbow sprinkle cake from scratch using a recipe inspired from Delish.com. This was the first time I baked a cake from the ground up and I was quite surprised at how easy (and how much fun) it was. This rainbow layer cake was not only eye catching, it was also delicious! Who doesn’t love a vanilla / buttercream cake covered in sprinkles and glitter?

Most the the ingredients I used were bought at my local grocery store. I did buy a few things on Amazon like the unicorn glitter confetti, the pink glitter dust, and the cake decorating kit. When it came to decorating it I watched a tutorial on how to get the sprinkles on there without creating a mess which you can also find at the bottom of this article.


For The Cake:

  • 6 egg whites
  • 1 c. sugar
  • 1 c. unsalted butter
  • 3 tbsp. applesauce
  • 2 tsp. pure vanilla extract
  • 2 whole eggs
  • 2¼ c. cake flour
  • 2 tsp. baking powder
  • pinch of salt
  • 4 different hues of food coloring
  • 2 c. Buttercream Frosting (below)
rainbow sprinkle cake from scratch
rainbow sprinkle cake from scratch

Buttercream Frosting:

  • 1 c. unsalted butter
  • 3 c. confectioners' sugar
  • 1 cup heavy cream
  • 1 tbsp. pure vanilla extract
  • About 1 cup sprinkles (rainbow, stars, nonpareils, and glitter)


Make The Cake:

rainbow sprinkle cake from scratch

Preheat oven to 350 degrees F. Line 4 6-inch cake pans with parchment paper, butter and flour so it doesn’t stick.

Beat egg whites with an electric mixer on medium-high speed until foamy, about 2 minutes. Increase mixer speed to high and continue beating until soft peaks form, about 3 minutes. Gradually add ½ cup of the sugar, continuing to beat until stiff peaks form, about 3 minutes more.

In another large mixing bowl, cream butter, the remaining ½ cup of sugar, applesauce, and vanilla on medium speed until light and fluffy, about 5 minutes. Add the eggs and mix on medium speed for 1 more minute.

Sift together flour, baking powder, and salt. Add to butter mixture and mix on medium speed for 1 minute. Pour in ¾ cup water and mix to combine. Fold in egg whites with a large spatula.

Divide batter evenly among 4 small bowls. Starting with the lightest color, tint batter with food coloring, whisking in a few drops at a time until the desired intensity is reached. Pour each of the colored batters into a different parchment-lined cake pan (each should be half full) and bake until a toothpick inserted in the center comes out clean, about 12 to 15 minutes.

Make the Buttercream Frosting:

rainbow sprinkle cake from scratch

With an electric mixer on medium-high speed, add butter, confectioners’ sugar, ½ cup at a time, add ¼ cup of heavy cream, at a time. Beat until smooth.

Scrape down the sides of the bowl with a rubber spatula. Add vanilla and beat for 1 minute more, or until soft and fluffy. Use immediately or refrigerate, covered, for up to 5 days.

Assembling the Cake: Stack layers according to the colors of the rainbow, spreading a thin layer buttercream between each. Using an offset spatula, frost the whole cake with a thin layer of buttercream.

Place cake on a freezer-safe plate. Freeze for 15 minutes, or until buttercream is firm. Remove from freezer and cover cake in sprinkles. (To learn how to decorate the cake, watch this tutorial.)


  • Make sure you clean the frosting from the side of your cake plate so that the sprinkles won’t stick.
  • Using your hands, start at the bottom and work your way up.
rainbow sprinkle cake from scratch
rainbow sprinkle cake from scratch


My life consists of writing, shopping, music, spending time with my boyfriend, working out, traveling and macarons from Bottega Louie. --- @agirlinla

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