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Funfetti Snack Cake with Cake Batter SMBC

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  • Author: Elizabeth Buuck
  • Prep Time: 15
  • Cook Time: 45
  • Total Time: 1 hour
  • Yield: 9 servings 1x


Small batch light and fluffy funfetti vanilla cake topped with Cake Batter Swiss Meringue Buttercream.



For Funfetti Cake

  • 1/2 C (1 Stick) Unsalted Butter, at room temperature
  • 3/4 C + 2 TBSP Granulated Sugar
  • 3 TBSP Vegetable Oil
  • 1 1/2 C All Purpose Flour
  • 1 tsp. Baking Powder
  • 1/2 tsp. Salt
  • 1 Lg Egg + 2 Egg Whites, at room temperature
  • 1/2 C Buttermilk, at room temperature
  • 1 tsp Vanilla Extract
  • 1 C Rainbow Sprinkles, + more for topping

For the Swiss Meringue Buttercream

  • 1 C Granulated Sugar
  • 4 Egg Whites
  • Pinch of Salt
  • 1 1/2 C (3 Stickes) Unsalted Butter, at room temperature
  • 1/2 tsp Vanilla Extract
  • 1/2 tsp Cake Batter Flavoring (or substitute 1/2 tsp imitation vanilla flavor)


For the Funfetti Cake

  • Preheat oven to 350 and line a 9X9 pan with parchment paper and nonstick spray
  • In a stand mixer, cream the sugar, butter, and oil for 5 minutes.
  • Add in egg and egg whites, mix to combine.
  • Stir the vanilla into the buttermilk. Set aside.
  • Whisk together the flour, baking powder, and salt. Set aside.
  • Alternate adding the dry ingredients and buttermilk to the butter and egg mixture. Start and end with dry ingredients. Stop mixing when a few flour streaks remain.
  • Toss the sprinkles with 2 TBSP flour to coat. Then fold sprinkles into batter.
  • Pour batter into prepared pan and bake at 350 for 35-40 minutes, or until a toothpick comes out mostly clean with a few moist crumbs attached. Let cool.

For the SMBC

  • Add the egg whites, sugar, and pinch of salt to a double boiler over medium heat. 
  • Whisk constantly until the sugar dissolves and mixture reaches 150-155 degrees. 
  • Pour mixture into stand mixer with the whisk attachment, whisk on high until mixture cools and stiff glossy peaks form, about 5-7 minutes.
  • Add vanilla and cake batter flavor. Mix.
  • Switch to paddle attachment. Cut butter into chunks. 
  • Add butter slowly with mixer on medium speed. 
  • Once butter is incorporated, continue to mix until buttercream is smooth. If it curdles slightly, continue to mix and it will come together. 
  • Add food color gel if desired.