Confetti Sheet Cake

Posted on June 23, 2025

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Let’s make baking a piece of cake! Today, I’m excited to share an easy and delicious Confetti Sheet Cake recipe that’s perfect for birthdays, get-togethers, or simply when you crave a slice of joy.

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Confetti Sheet Cake

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  • Yield: 12 1x
  • Category: Dessert

Ingredients

Scale

*For the cake:*

  • 1 cup softened butter (I like to use salted, but unsalted works too!)
  • 1 ½ cups granulated sugar
  • 1 tbsp vanilla extract
  • 3 eggs at room temperature
  • 3 cups all-purpose flour
  • 1 tsp baking powder
  • ½ tsp baking soda
  • ¼ tsp salt
  • 1 ¼ cup buttermilk at room temperature
  • ¾ cup rainbow sprinkles

*For the frosting:*

  • 1 cup softened butter
  • 4 ½ – 5 cups powdered sugar
  • 1 ½ tsp vanilla extract
  • ¼ tsp salt
  • ¼ cup heavy cream at room temperature
  • ¼ cup rainbow sprinkles


Instructions

*For the cake:*

  1. Grease and line a 9×13 pan. Preheat the oven to 350°F.
  2. In a stand mixer, beat together butter, sugar, and vanilla until light and fluffy (about 4-5 minutes).
  3. Add eggs one at a time on low speed.
  4. Mix in flour, baking powder, baking soda, and salt.
  5. Pour in buttermilk while mixing on low until combined.
  6. Fold in rainbow sprinkles with a spatula.
  7. Pour batter into the prepared pan and bake for 30-35 minutes.
  8. Allow the cake to cool completely.

*For the frosting:*

  1. Once the cake is cool, cream together butter and powdered sugar in a stand mixer for 1 minute.
  2. Add vanilla, salt, and heavy cream gradually until desired consistency.
  3. Prepare a piping bag with a round tip and fill with â…“ of the frosting.
  4. Spread the remaining frosting evenly over the cooled cake.
  5. Pipe frosting around the edges and sprinkle on remaining sprinkles.
  6. Serve and enjoy your delightful Confetti Sheet Cake!

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