Rainbow St. Patrick's Day Cake

The perfect St. Patrick's Day dessert topped with fun Lucky Charm marshmallows!
Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes
Servings 12
Author Gina Kleinworth


  • 1 white cake mix - plus ingredients per box instructions- oil water, eggs)
  • Food Color red, orange, yellow, green, blue & purple
  • 1 can pre-packaged frosting or homemade if you prefer
  • Lucky Charm "like" marshmallows - just the marshmallows not the cereal
  • rainbow sprinkles


  1. Preheat oven according to box mix directions
  2. Spray a 9x13 metal baking pan with cooking spray - set aside
  3. In mixer bowl, combine box mix ingredients & beat until combined
  4. Ladle out equal portions of batter into 6 separate bowls
  5. Mix in several drops of food color - one for each bowl so you have a rainbow of batter
  6. Carefully drizzle batter into the prepared pan
  7. (I started with red & spread it out to cover the bottom of the pan)
  8. Then follow with orange - drizzling on in a random pattern - do not stir or mix - just let them sit on top of each other
  9. Follow with remaining colors - yellow, green, blue, purple
  10. Bake to package instructions - remove & cool completely before adding frosting
  11. Once cool, spread on frosting, add marshmallows & sprinkles
  12. Enjoy!