Did you think you had seen all the rainbow desserts? We have news for you: we created a better option for an easy colorful dessert. This Rainbow Cake in a Baking Dish recipe will be your new favorite dessert that you can prepare with vanilla-flavored bread. The portions for preparing a dessert are fundamental, so keep in mind that for this Rainbow Cake recipe, you should check the size of the baking dish to adjust the recipe and have the right mixture.