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Christmas Funfetti Sheet Cake

Print Recipe
Soft Funfetti Cake Layers frosted in bright and festive vanilla buttercream designs.
Servings 12 servings
Author Mandy Merriman - Baking with Blondie

Equipment

  • 9x13 sheet cake pan
  • Piping tips and piping bags 1M (large star), 1A (large circle), 6B (large french tip), #125 (pedal/ruffle), #32 (smaller star)
  • pink, red, and green gel colors

Ingredients

Funfetti Sheet Cake

  • 3/4 cup buttermilk room temperature
  • 2/3 cup sour cream room temperature
  • 4 large egg whites room temperature
  • 1/3 cup vegetable oil
  • 1 Tablespoon vanilla
  • 1/2 cup Christmas jimmies/sprinkles
  • 1 15.25oz Box White Cake Mix I used Duncan Hines

Vanilla Buttercream

  • 1 1/2 cup (or 3 sticks) Unsalted Butter let sit out for 10 minutes
  • 1 pinch salt
  • 1 Tablespoon vanilla
  • 1/2 cup heavy cream
  • 7-8 cups powdered sugar
  • colored gel coloring (red, pink, and light green)

Extras

  • 1 Tablespoon silver dragees

Instructions

For the Funfetti Cake

  • Preheat the oven to 325 degrees, and prep a 9x13 sheet pan/dish with shortening/spray/goop/nonstick. Set aside.
  • In a large bowl, whisk together all the ingredients except for the cake mix and sprinkles. Sift in the cake mix, then gently fold in the sprinkles until combined. Spread into the prepared 9x13 pan and bake for 20-14 minutes. Let cool.

For the Buttercream

  • In the bowl of a stand mixer, whip up the butter until it's light and fluffy, about 2 minutes. Add in the salt, vanilla, and heavy cream and whip up again to combine. Add in the powdered sugar and whip up on low speed until combined, then on high speed for 2 minutes to lighten the texture.
  • Split the buttercream into 4 bowls and tint three of the bowls pink, red, and light green using the gel coloring. Add the buttercream to piping bags fitted with the following piping tips: 1M (large star), 1A (large circle), 6B (large french tip), #125 (pedal/ruffle), #32 (smaller star).
    You can make the colors any tips you'd like, but here's what I did:
    Red: 1M
    Pink: 1A
    Light Green: #125 and #32
    White: 6B
  • One by one, pipe on rosettes, swirls, drop stars, and ruffles in a random pattern all over the top of the cake. Sprinkle on the silver dragees.