Funfetti Layer Cake Upgrade
Box Hack

Funfetti Layer Cake Upgrade

Back to Bakemix-ology

Take a box of Funfetti mix and turn it into a three-layer celebration cake with homemade vanilla buttercream and extra sprinkles. Childhood joy, grown-up execution.

Funfetti Layer Cake Upgrade
Prep30 min
Cook28 min
DifficultyMedium
Cal / serving~466

Servings

12

12 slices · ~466 cal each · ~5588 cal total

Ingredients

  • 1 box Funfetti cake mix (15.25 oz box)
  • 1 cup whole milk (replaces water)
  • ½ cup unsalted butter (melted, replaces oil)
  • 3 large eggs
  • ½ cup sour cream
  • 1 ½ cups unsalted butter (softened, for frosting)
  • 5 cups powdered sugar
  • 4 tbsp heavy cream
  • 2 tsp vanilla extract
  • ½ cup rainbow sprinkles (extra)

You'll need

  • ·Three 8-inch round cake pans
  • ·Stand mixer or hand mixer
  • ·Mixing bowls
  • ·Offset spatula
  • ·Cake turntable (optional)
  • ·Parchment paper

Instructions

  1. 1

    Preheat oven to 350°F. Grease and line three 8-inch round pans.

  2. 2

    Beat cake mix, milk, melted butter, eggs, and sour cream together until smooth. Divide evenly among pans.

  3. 3

    Bake 24–28 minutes until a toothpick comes out clean. Cool completely before frosting.

  4. 4

    Beat softened butter until fluffy. Add powdered sugar 1 cup at a time, alternating with cream. Add vanilla and beat until smooth and spreadable.

  5. 5

    Stack layers with frosting between each. Apply a thin crumb coat, chill 15 minutes, then frost the outside. Finish with extra sprinkles.

Calorie estimates are approximate and calculated from ingredient quantities. Actual values may vary.