Ingredients
2-1/4 cups cake flour1-1/2 cups sugar3-1/2 teaspoons baking powder1/2 teaspoon salt1/2 cup unsalted butter, softened4 large egg whites, room temperature3/4 cup 2% milk1 teaspoon clear vanilla extract1/2 teaspoon almond extract1/3 cup rainbow jimmiesBUTTERCREAM:4 large egg whites1 cup packed light brown sugar1/4 teaspoon salt1-1/2 cups unsalted butter, softened1-1/2 teaspoons clear vanilla extract1/2 to 3/4 teaspoon yellow food coloringConfetti sprinkles
Preparation
Preheat oven to 350°. Line bottoms of 2 greased 9-in. round baking pans with parchment; grease parchment.
In a large bowl, whisk flour, sugar, baking powder and salt. Beat in butter. Add egg whites, 1 at a time, beating well after each addition. Gradually beat in milk and extracts. Gently fold in jimmies.
Transfer batter to prepared pans. Bake 20-25 minutes or until a toothpick inserted in center comes out clean. Cool in pans 10 minutes before removing to wire racks; remove paper. Cool completely.
For buttercream, in a heatproof bowl of a stand mixer, whisk egg whites, brown sugar and salt until blended. Place over simmering water in a large saucepan over medium heat. Whisking constantly, heat mixture until a thermometer reads 160°, 2-3 minutes.
Remove from heat. With whisk attachment of stand mixer, beat on high speed until stiff glossy peaks form, about 7 minutes.
Gradually beat in butter, a few tablespoons at a time, on medium speed until smooth. Beat in vanilla and enough food coloring to achieve desired color.
Immediately spread frosting between layers and over top and sides of cake. Decorate with sprinkles. Store in refrigerator.
