Bake this irresistible Christmas Rainbow Cake at home. Made with white cake, lime flavor and boiling water. Easy step-by-step instructions included.
This Christmas Rainbow Cake relies on simple, everyday ingredients such as supermoist white cake mix, boiling water and (8 oz.) container cool whip. It comes together quickly and makes 4 servings, at about 1068 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 Christmas 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