RAINBOW FROSTING RECIPES

Steps:

• Heat oven to 350°F. Line two 15x10x1-inch pans with cooking parchment paper.
• In large bowl, beat eggs with electric mixer on high speed until thick and lemon-colored, about 6 minutes. Add cake mix, sour cream, water and oil. Beat on low speed 30 seconds, then on medium speed 1 minute.
• Divide batter into 6 small bowls, about 3/4 cup batter per bowl. Add red, orange, yellow, green, blue and purple gel food colors, one to each bowl; mix. Pour each colored batter into a decorating bag or resealable food-storage plastic bag, and cut one corner off each bag. For better control with cake batter, be sure to cut small opening on end of each resealable bag.
• Starting with purple batter, carefully squeeze a thin diagonal line of colored batter onto each pan; repeating with blue, green, yellow, orange and red to make a rainbow-striped pattern. Continue until all batter has been used and pans are equally filled. It's ok to leave small spaces in between colors, as batter will fill in during baking.
• Bake 8 to 10 minutes or until top springs back when touched. Meanwhile, sprinkle powdered sugar over two clean kitchen towels. Remove cakes from oven. Run metal spatula around edges of pans; carefully turn one on to each kitchen towel. Peel away parchment paper. Immediately roll up cake and towel from narrow end. Allow cakes to cool 30 minutes.
• In medium bowl, mix frosting and whipped topping. Mix in Betty Crocker™ Candy Shop decors rainbow chips, if desired.
• Carefully unroll cakes; spread half of the filling over each cake. Roll cakes up into logs; refrigerate at least 1 hour before serving.
• Cut into slices to serve. Store covered in refrigerator.

Steps:

• Preheat the oven to 375 degrees F. Spray the bottom and sides of six 8-inch round cake pans; dust with flour and tap out excess.
• Whisk together the flour, baking powder and salt in a medium bowl; set aside.
• Beat the butter, sugar and oil in a large bowl with an electric mixer on medium-high speed until light in color and fluffy, about 5 minutes. Beat in the eggs, one at a time, then the vanilla seeds, until combined.
• Transfer the creamed mixture to a very large mixing bowl, then alternate folding in the flour mixture and the milk with a spatula, adding the flour in 3 additions and the milk in 2, starting and ending with the flour, just until smooth. Divide the batter equally among 6 mixing bowls. Using gel food colors, tint each bowl with one of the colors of the rainbow. Pour each color into its own prepared cake pan.
• Bake, rotating the pans halfway through, until a toothpick inserted in the centers comes out clean, 18 to 20 minutes. Cool the cakes in the pans on a rack for 10 minutes, then remove the cakes to the rack to cool completely.
• Level the tops of any cake layers that have domed by slicing the domes off with a serrated knife. Put some buttercream into a pastry bag fitted with a large round tip. Put the bottom cake layer onto a cake plate. Pipe around the edge of the cake layer to create a frosting "dam." Fill the center with a thin layer of jam (about 1/2 cup). Top with another cake layer and repeat until you have stacked and filled all the layers. Frost the outside of the cake with the remaining buttercream and decorate as desired.
• In the bowl of a stand mixer, combine the confectioners' sugar, butter, milk, vanilla seeds and salt. Beat on low speed for a while. When the sugar is incorporated, turn the speed up and beat until the buttercream is fluffy and smooth. If it's too wet, add a bit more confectioners' sugar. If it's too stiff, add a bit more butter. Be sure to scrape the sides of the bowl once or twice to make sure everything is combined.
• Use immediately or store in an airtight container at room temperature for up to 24 hours or in the fridge for up to 2 weeks. Rewhip cold buttercream before using.