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Homemade Funfetti Cake with Birthday Cake Buttercream

July is full of fun birthdays in our family, so I decided to make this festive homemade funfetti birthday cake for any birthday occasion that you might have as well! It is moist and fluffy, with lots of colorful sprinkles throughout and a fun pink birthday cake buttercream on top.
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Prep Time 30 minutes
Cook Time 35 minutes
Cooling Time 1 hour
Total Time 2 hours 5 minutes
Servings: 16 slices
Course: Dessert
Cuisine: American
Ingredients Method Notes

Ingredients
  

For the Homemade Funfetti Cake
  • 1 cup unsalted butter, room temperature (2 sticks)
  • ⅓ cup vegetable oil
  • 1¾ cup sugar
  • 3 large eggs, room temperature
  • 1 tbsp vanilla extract
  • 3 cups cake flour
  • 2 tsp baking powder
  • 1 tsp salt
  • 1 cup buttermilk, room temperature
  • ¼ cup rainbow sprinkles
For the Birthday Cake Buttercream
  • 1½ cup unsalted butter, room temperature (3 sticks)
  • 4½ cup powdered sugar
  • 3 tbsp heavy whipping cream
  • 2 tsp clear imitation vanilla
  • Soft pink food coloring

Method
 

For the Homemade Funfetti Cake
  1. Preheat oven to 325°F. Grease a 9x13 inch pan.
  2. In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, cream butter, oil and sugar until light and fluffy (5-7 minutes).
  3. Add eggs, then egg whites, 1 at a time, beating well after each addition. Beat in vanilla. In another bowl, whisk flour, baking powder and salt. Add to creamed mixture alternately with buttermilk, beating well after each addition. Fold in sprinkles.
  4. Transfer to prepared pan. Bake until a toothpick inserted in center comes out clean, 35-40 minutes. Cool completely on wire rack.
For the Birthday Cake Buttercream
  1. In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, beat butter until creamy. Gradually beat in powdered sugar until smooth. Add cream, vanilla and food coloring. Beat until light and fluffy, 5-7 minutes. Frost top of cake with frosting and top with additional sprinkles if desired.

Notes

Recipe adapted from Taste of Home
I tried this recipe at high altitude (about 5,800 feet) and it worked great as is! This will also work at sea level as well.
Helpful Tools
KitchenAid Stand Mixer | Mixing Bowls | Imitation Vanilla | Gel Food Coloring