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Perfect Funfetti Birthday Cake Recipe with Easy Vanilla Buttercream Frosting

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A playful and colorful funfetti birthday cake with a moist, tender crumb and silky vanilla buttercream frosting. Perfect for celebrations and easy to make with simple ingredients.

Ingredients

Scale
  • 2 ½ cups all-purpose flour (315 g), sifted
  • 2 ½ teaspoons baking powder
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup (2 sticks) unsalted butter, softened (227 g)
  • 1 ¾ cups granulated sugar (350 g)
  • 4 large eggs, room temperature
  • 2 teaspoons pure vanilla extract
  • 1 cup sour cream (240 ml)
  • ½ cup milk, room temperature (120 ml)
  • ¾ cup rainbow sprinkles (120 g), tossed in 1 tablespoon flour
  • For the Vanilla Buttercream Frosting:
  • 1 cup (2 sticks) unsalted butter, softened (227 g)
  • 4 cups powdered sugar, sifted (480 g)
  • 1 ½ teaspoons pure vanilla extract
  • 2–3 tablespoons heavy cream (30–45 ml)
  • Pinch of salt

Instructions

  1. Preheat oven to 350°F (175°C). Grease and flour two 8-inch round cake pans and line bottoms with parchment paper.
  2. In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
  3. In a large bowl, cream butter and sugar with an electric mixer on medium speed until light and fluffy, about 3-4 minutes.
  4. Add eggs one at a time, beating well after each addition. Scrape down bowl as needed.
  5. Mix in vanilla extract.
  6. With mixer on low, alternately add dry ingredients in three additions with sour cream and milk, starting and ending with dry ingredients. Mix just until combined.
  7. Toss sprinkles with flour and gently fold into batter with a spatula.
  8. Divide batter evenly between prepared pans and smooth tops.
  9. Bake 30-35 minutes until a toothpick inserted in center comes out clean or with a few crumbs. Avoid opening oven door during baking.
  10. Cool cakes in pans for 10 minutes, then transfer to wire racks to cool completely.
  11. For frosting, beat butter until creamy. Gradually add powdered sugar, mixing on low to avoid sugar cloud.
  12. Stir in vanilla extract, heavy cream, and salt. Adjust consistency with more cream or powdered sugar as needed.
  13. Assemble cake by placing one layer on plate, spreading frosting on top, adding second layer, then frosting top and sides evenly.
  14. Optional: sprinkle extra jimmies on top for decoration.

Notes

Use room temperature ingredients for best results. Toss sprinkles in flour before folding to prevent sinking. Do not overmix batter to keep cake tender. Let cake cool completely before frosting to avoid melting buttercream. Frosting consistency can be adjusted with heavy cream or powdered sugar. For dairy-free or gluten-free adaptations, see recipe notes.

Nutrition

Keywords: funfetti cake, birthday cake, vanilla buttercream, easy cake recipe, colorful cake, celebration cake, moist cake

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