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This Funfetti Cake is a vibrant and fun dessert, perfect for birthdays or any celebration! Moist, soft, and loaded with colorful sprinkles, it’s paired with a fluffy vanilla buttercream that adds the perfect finishing touch. The combination of real vanilla extract and rainbow jimmies creates an irresistible treat that will make any occasion festive and memorable.

Ingredients

Funfetti Cake:

  • 1 cup unsalted butter, room temperature
  • 2 cups granulated sugar
  • 1/2 cup vegetable or canola oil
  • 4 large eggs, room temperature
  • 1 tbsp vanilla extract
  • 3 1/4 cups all-purpose flour
  • 2 1/2 tsp baking powder
  • 1/2 tsp baking soda
  • 1 tsp salt
  • 1/2 cup full-fat sour cream, room temperature
  • 1 cup buttermilk, room temperature
  • 3/4 cup rainbow jimmies sprinkles

Buttercream:

  • 1 1/2 cups unsalted butter, room temperature
  • 5 cups powdered sugar
  • 1 tbsp vanilla extract
  • 23 tbsp milk
  • 1/2 cup sprinkles for decorating

Instructions

  • Preheat oven to 350°F. Grease and line three 9-inch cake pans with parchment paper.
  • In a bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
  • Cream butter and sugar together until light and fluffy. Add oil and mix well.
  • Beat in eggs, one at a time, then mix in vanilla extract.
  • Add sour cream and mix until combined.
  • Alternately add the dry ingredients and buttermilk, starting and ending with the dry ingredients. Mix until just combined.
  • Gently fold in the rainbow sprinkles.
  • Divide the batter evenly between the cake pans and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Cool completely.
  • For the buttercream, beat the butter until smooth and creamy. Gradually add powdered sugar, vanilla extract, and milk. Adjust consistency with more milk if needed.
  • Frost the cake layers with buttercream and decorate with sprinkles.

Notes

  • For best results, ensure all ingredients are at room temperature.
  • The sprinkles may bleed slightly into the batter during baking, which is perfectly fine and adds to the fun effect!
  • If you don’t have buttermilk, you can substitute with regular milk or make your own buttermilk by adding 1 tbsp vinegar or lemon juice to 1 cup of milk.