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Funfetti-Sheet- Cake
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Funfetti Sheet Cake

Prep Time20 minutes
Cook Time32 minutes

Ingredients

  • 3/4 cup unsalted butter, softened
  • 1 1/2 cups granulated sugar
  • 4 large eggs
  • 2 tsp vanilla extract
  • 1 cup sour cream or Greek yogurt
  • 1/2 cup whole milk
  • 2 1/2 cups all purpose flour
  • 2 1/2 tsp baking powder
  • 1/2 tsp baking soda
  • 1/2 tsp salt
  • 1/2 cup rainbow sprinkles

Frosting

  • 3/4 cup unsalted butter, softened
  • 3 cups powdered sugar
  • 1 1/2 - 2 tbsp heavy cream
  • 1 1/2 tsp vanilla extract
  • pinch of salt
  • extra sprinkles for topping

Instructions

  • Preheat oven to 350°F. Grease a 9x13-inch cake pan and line with parchment for easy removal.
  • Whisk dry ingredients: In a medium bowl, combine flour, baking powder, baking soda, and salt. Set aside.
  • Cream butter & sugar: In a large bowl using a hand or stand mixer, beat softened butter and sugar together until light and fluffy (about 2–3 minutes).
  • Add eggs & vanilla: Beat in eggs one at a time, scraping down the bowl as needed. Stir in vanilla.
  • Mix in sour cream and milk: Add sour cream and mix until smooth. Then add milk and mix again—don’t worry if it looks a little curdled at this point!
  • Add dry ingredients: Slowly mix in the dry ingredients on low speed until just combined. Do not overmix.
  • Fold in sprinkles: Gently fold in the sprinkles with a rubber spatula.
  • Bake: Pour the batter into the prepared pan and smooth the top. Bake for 32–36 minutes, or until a toothpick inserted in the center comes out clean. Let the cake cool completely in the pan.