Layered cakes are usually our go to, but this cake roll is even more fun! Bake up your favorite cake mix, roll it up, lay out the sprinkles, and you've got a colorful rainbow treat for St. Patrick's Day. Mandy Merriman shares the step-by-step process. She shares the best way to cool your cake for this method, how to layer on the sprinkles, and some fun additions to try.