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Prep Time 20 minutes
Cook Time 25 minutes
Total Time 1 hour 15 minutes
Makes 10 cups

Ingredients

  • 1 box 15.25 ounces yellow cake mix, plus ingredients called for on the box (eggs, oil, water)
  • 1 cup mini candy-coated chocolate pieces
  • 1 cup unsalted butter softened
  • 4 cups powdered sugar
  • 1 teaspoon vanilla extract
  • 2 to 3 tablespoons milk
  • 2 tablespoons rainbow sprinkles

Instructions

  • Preheat oven to 350F and grease a 9x13 pan.
  • Prepare the cake batter per the box directions, beating until smooth with no streaks of dry mix, about 2 minutes.
  • Fold in the candy pieces by hand so they stay whole and do not bleed color into the batter.
  • Pour batter into the prepared pan and spread evenly.
  • Bake 24 to 28 minutes, until a toothpick inserted in the center comes out with a few moist crumbs, not wet batter.
  • Cool the cake completely in the pan on a wire rack, about 45 minutes, before cutting (warm cake will mash when cubed).
  • Cut the cooled cake into 1-inch cubes.
  • Beat butter, powdered sugar, vanilla and milk into a smooth buttercream, thick enough to hold a peak when you lift the beater.
  • Spoon a layer of cake cubes into the bottom of ten clear 9-ounce cups.
  • Add a layer of frosting, then repeat cake and frosting once more in each cup.
  • Top each cup with a swirl of frosting and a scatter of rainbow sprinkles.
  • Chill 10 minutes if the kitchen is warm, just to firm the frosting before serving.

Good to Know

Bake and cube the cake a day ahead and store it airtight, then assemble the cups just before serving so the frosting stays neat.