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5 from 2 votes

Funfetti Cake with Vanilla Buttercream Frosting

Prep Time15 mins
Cook Time30 mins
Total Time45 mins
Course: Dessert
Servings: 12
Author: Pam - For the Love of Cooking / Original by Simply Scratch


  • Funfetti Cake:
  • 4 whole egg whites
  • 1 cup whole milk
  • 2 tsp real vanilla extract
  • 3 cups cake flour sifted
  • 1 1/2 cups white sugar
  • 1 tbsp + 1 tsp baking powder
  • 1/4 tsp salt
  • 12 tbsp 1 1/2 sticks unsalted butter, softened to room temperature
  • 1/2 cup rainbow sprinkles plus more for top

  • Vanilla Buttercream Frosting:
  • 1 cup unsalted butter 2 sticks, softened to room temperature!!!
  • 4 cups powdered sugar sifted
  • 2 tsp real vanilla extract
  • Pinch of salt
  • 4-6 tbsp whole milk to taste


  • Preheat the oven to 350 degrees. Butter and lightly flour a 9 x 13 baking dish (or coat with baking spray).
  • Prepare the cake by whisking the egg whites, whole milk, and vanilla until well combined.
  • Sift the cake flour, sugar, baking powder, and salt together in a large mixing bowl.
  • Add the butter along with half of the egg white mixture and beat with a mixer.
  • Scrape the sides and bottom of the bowl, then slowly add the remaining egg white mixture and beat until just combined.
  • Fold in the sprinkles and pour into the prepared baking dish.
  • Place into the oven and bake for 30-35 minutes, or until a tester inserted into the center comes out clean.
  • Allow to cool on a wire rack completely.
  • Prepare the vanilla buttercream frosting by placing the room temperature butter in a large bowl.
  • Beat with a mixer on medium speed until smooth, creamy, and light in color.
  • Add the sifted powdered sugar and a pinch of salt then beat with the mixer until combined.
  • Add the vanilla and a few tablespoons of milk at a time until your frosting is at the desired consistency.
  • Finish the cake
    once it has cooled completely by coating the cooled cake evenly with the vanilla buttercream frosting.
  • Sprinkle the top with sprinkles then slice and serve. Enjoy.