Bake this irresistible Rainbow Cake at home. Made with white cake mix, boiling water, red jello and cold water. Easy step-by-step instructions included.
This Rainbow Cake relies on simple, everyday ingredients such as white cake mix, boiling water, cool whip and red jello (3 oz.). It comes together quickly and makes 4 servings, at about 530 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.
Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this Rainbow Cake delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.
Updated Jun 30, 2026