1. Preheat oven to 350°F. Beat butter and sugar in large bowl with electric mixer on medium speed until light and fluffy. Add eggs, vanilla, cake mix, baking powder and milk. Beat 3 minutes, scraping sides of bowl occasionally. Spoon batter into 2 greased and floured 8- or 9-inch round cake pans.
2. Bake 30 to 33 minutes or until toothpick inserted in center comes out clean. Cool 15 minutes; invert cakes onto wire racks. Turn layers right side up and cool completely.
3. Spread one cake layer with icing and a layer of strawberry or raspberry preserves, if desired. Top with second cake layer. Frost top and side of cake with remaining icing. Cover the frosted sides of the cake with sprinkles, if desired. Test Kitchen Tip:
Mix a few drops of your favorite classic McCormick® Assorted Food Colors or
McCormick® Assorted Neon! Food Colors into the cake batter or frosting -- or both! (Keep in mind that if you start with a yellow cake mix, any color you add to it will be yellow plus the color you are adding. For instance, if you add blue food color to a yellow cake mix, you'll get a green cake!)