Unicorn Cake

Directions

• Preheat oven to 350°. Line bottoms of three 6-in. round baking pans with parchment; grease and flour pans.
• In a large bowl, whisk flour, sugar, baking powder and salt. Beat in butter until crumbly. Add egg whites, 1 at a time, beating well after each addition. Gradually beat in 1/4 cup milk and extracts; beat on medium until light and fluffy, about 2 minutes. Gradually beat in remaining milk. Gently fold in jimmies.
• Transfer batter to prepared pans. Bake until a toothpick inserted in center comes out clean, 25-30 minutes. Cool in pans 10 minutes before removing to wire racks; remove paper. Cool completely.
• For buttercream, in a microwave, melt chocolate with cream until smooth, stirring every 30 seconds. Set aside to cool slightly. In a heatproof bowl of a stand mixer, whisk egg whites, sugar, cream of tartar and salt until blended. Place over simmering water in a large saucepan over medium heat. Whisking constantly, heat mixture until a thermometer reads 160°, 8-10 minutes.
• Remove from heat. With whisk attachment of stand mixer, beat on high speed until cooled to 90°, about 7 minutes. Gradually beat in butter, a few tablespoons at a time, on medium speed until smooth; beat in vanilla and white chocolate mixture.
• Spread frosting between layers and over top and sides of cake. Divide remaining buttercream into smaller portions; stir in food coloring to achieve desired colors. Decorate as desired. Store in refrigerator.