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Easy Fluffy Funfetti Sheet Cake Recipe with Perfect Vanilla Buttercream Frosting

Easy Fluffy Funfetti Sheet Cake - featured image
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A light, airy funfetti sheet cake topped with silky vanilla buttercream frosting, perfect for any celebration or casual dessert.

Ingredients

Scale
  • 2 ½ cups (315g) all-purpose flour
  • 2 ½ teaspoons baking powder
  • ½ teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup (227g) unsalted butter, softened
  • 1 ¾ cups (350g) granulated sugar
  • 4 large eggs, room temperature
  • 2 teaspoons pure vanilla extract
  • 1 cup (240ml) buttermilk, room temperature
  • ¾ cup (about 90g) rainbow sprinkles (sturdy jimmies or non-melting)
  • For the Vanilla Buttercream Frosting:
  • 1 cup (227g) unsalted butter, softened
  • 3 ½ cups (420g) powdered sugar, sifted
  • 2–3 tablespoons (30-45ml) heavy cream or whole milk
  • 1 ½ teaspoons pure vanilla extract
  • Pinch of salt
  • Extra rainbow sprinkles for decoration (optional)

Instructions

  1. Preheat oven to 350°F (175°C). Grease a 9×13 inch pan lightly with butter or non-stick spray and line with parchment paper. (5 minutes)
  2. In a medium bowl, sift together flour, baking powder, baking soda, and salt. Set aside. (5 minutes)
  3. In a large bowl, beat softened butter and granulated sugar on medium speed until pale and fluffy, about 3 to 4 minutes. (7 minutes)
  4. Beat in eggs one at a time, mixing well after each addition. Stir in vanilla extract. (4 minutes)
  5. Reduce mixer speed to low. Alternately add dry ingredients and buttermilk in three parts, starting and ending with dry ingredients. Mix just until combined after each addition. (6 minutes)
  6. Gently fold in rainbow sprinkles with a rubber spatula to avoid color bleeding. (2 minutes)
  7. Pour batter evenly into prepared pan and smooth the top. Bake for 30 to 35 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs. Cake should spring back lightly when pressed. (30–35 minutes)
  8. Let cake cool in pan for 15 minutes, then transfer to a cooling rack to cool completely before frosting. (at least 30 minutes)
  9. For the buttercream, beat softened butter on medium speed until creamy, about 2 minutes. Gradually add sifted powdered sugar on low speed. Add heavy cream or milk, vanilla extract, and salt. Beat on high for 3-5 minutes until fluffy and spreadable. Adjust cream or sugar for desired consistency. (10 minutes)
  10. Spread buttercream evenly over cooled cake and scatter extra rainbow sprinkles on top for decoration. (5 minutes)

Notes

Use room temperature ingredients for best results. Fold sprinkles in gently to avoid color bleeding. Cool cake completely before frosting to prevent melting. If batter is too thick, add a splash more buttermilk. Tent cake with foil if edges brown too quickly. For dairy-free or gluten-free versions, substitute ingredients as suggested.

Nutrition

Keywords: funfetti cake, sheet cake, vanilla buttercream, easy cake recipe, birthday cake, fluffy cake, sprinkles cake

Find it online: https://twinkletaste.com/easy-fluffy-funfetti-sheet-cake-recipe-with-perfect-vanilla-buttercream-frosting/