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Classic Confetti Cake - tender and fluffy vanilla cake layers, filled with sprinkles and covered with a whipped vanilla buttercream. #confetticake #birthdaycake #bestbirthdaycake #funfetticake #birthdaycakerecipe #vanillabuttercream #cakebycourtney
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4.69 from 19 votes

Confetti Birthday Cake

Moist and fluffy vanilla cake layers, lots of sprinkles and a whipped vanilla buttercream.
Prep Time1 hr 30 mins
Cook Time20 mins
Total Time1 hr 50 mins
Course: Dessert
Cuisine: Cake
Keyword: Confetti Cake, Funfetti Birthday Cake, Funfetti Cake
Servings: 20

Ingredients

FOR THE CAKE

  • 1 cup (226 g) unsalted butter room temperature
  • 1 3/4 cups (350 g) granulated sugar
  • 1/3 cup (72.6 g) vegetable oil
  • 3 large whole eggs room temperature
  • 3 large egg whites room temperature
  • 1/4 cup (60 g) sour cream room temperature
  • 3 cups (345 g) cake flour
  • 1 tablespoon (14 g) baking powder
  • 1 teaspoon (6 g) salt
  • 1 cup (240 g) buttermilk room temperature
  • 1 tablespoon (12 g) vanilla extract
  • 1/4 cup (40g) rainbow sprinkles

FOR THE BUTTERCREAM

  • 2 cups (452 g) unsalted butter chilled (I take the butter out of the fridge 30 minutes before I make my frosting)
  • 6 cups (750 g) powdered sugar measured then sifted
  • 4 tablespoons (57.75 g) heavy whipping cream
  • 2 teaspoons (8.4 g) clear vanilla extract
  • *This buttercream recipe makes enough to fill and cover your cake. If you want to add additional piping, you’ll want to make an extra 1/2 batch.

Instructions

FOR THE CAKE

  • Preheat the oven to 325 degrees F. Prepare three 8-inch or four 6-inch round cake pans with non-stick spray, parchment paper on the bottom of the pan, and another coat of spray. Set aside.
  • In a medium size bowl, whisk together the cake flour, baking powder and salt. Set aside.
  • In the bowl of a stand mixer, fitted with the paddle attachment, beat the butter, oil, and sugar on high until fluffy and smooth, about 5 minutes.
  • Add the eggs and the egg whites, one at a time to the bowl and beat on medium until well incorporated. Add the sour cream and beat on medium speed for a minute or so. It may look curdled, don't stress.
  • Turn the mixer on low and add 1/3 of the flour mixture to the butter mixture and mix until fully incorporated. Then add half of the buttermilk and blend well, followed by another 1/3 of the flour mixture, the second half of the buttermilk and lastly, add the remaining flour mixture and mix until incorporated.
  • Add the vanilla extract and beat on low until incorporated. Scrape down the sides of the bowl and mix on low for another 30 seconds. Fold in the sprinkles.
  • Evenly distribute the cake batter among the three 8-inch or four 6-inch pans and bake for 23 to 28 minutes, until toothpick comes out with just a few moist crumbs on it.
  • Remove cakes from the oven and let cool in pans for 10 minutes before inverting onto cooling racks.
  • When cakes are completely cooled, I like to wrap each cake layer individually with plastic wrap and stick it in the refrigerator or freezer until I’m ready to frost. The cake will be easier to work with if it’s cooled a bit. If I’m making the cake a day or two before I actually need to frost it, I put it in the freezer to ensure freshness. If I’m frosting same-day, I’ll just put it in the refrigerator to chill until needed.

FOR THE BUTTERCREAM:

  • In the bowl of a stand mixer fitted with a paddle attachment, cream the butter for about 2 minutes. This will soften the butter without it having to be warm.
  • With the mixer on low speed, gradually add the sifted powdered sugar, one cup at a time, mixing a little in between each addition.
  • With mixer on medium speed, add whipping cream, vanilla and salt.
  • Turn the mixer to medium-high speed and beat for an additional 5 to 7 minutes. The frosting will become lighter in color and texture.
  • Before spreading on your cake, spend a couple minutes mixing the buttercream by hand with a wooden spoon to push out the air pockets.

ASSEMBLY

  • Place the first cake layer, top side up. Add about 3/4 to 1 cup of frosting. Spread over the cake layer as evenly as possible. Make sure to get eye level with the cake to ensure the frosting is spread evenly over the cake.
  • Repeat this step until you get to the final cake layer, which you will lay top side down.
  • Apply a thin coat of buttercream around the entire cake to lock in the crumbs. Freeze for about 10 minutes.
  • After the crumb coat is set, continue frosting and decorating the cake.