Rainbow St. Patrick’s Day Cake Recipe

Celebrate St. Patrick’s Day in vibrant style with this Rainbow St. Patrick’s Day Cake! Topped with colorful marshmallows from Lucky Charms, this bright and festive cake is perfect for adding a pop of color and cheer to your celebration. It’s an easy-to-make dessert that’s as fun to decorate as it is to eat, sure to be a hit at any party.



  • 1 box white cake mix (plus ingredients called for on the box: oil, water, eggs)
  • Red, orange, yellow, green, blue, and purple food coloring


  • 1 can pre-packaged frosting or homemade, if preferred


  • Lucky Charm marshmallows (just the marshmallows, not the cereal)
  • Rainbow sprinkle


  1. Prep: Preheat oven as directed by cake mix. Grease a 9×13 inch baking pan.
  2. Batter Preparation: Mix cake batter as directed on the box. Divide the batter into six bowls, adding a different food coloring to each to create a rainbow of colors.
  3. Layering: Start with red batter, spreading it to cover the bottom of the pan. Add the other colors in layers without mixing—drizzle each color randomly to maintain distinct layers.
  4. Baking: Bake as per box instructions until a toothpick inserted comes out clean. Allow to cool completely.
  5. Decorating: Once cool, spread frosting over the cake. Top with marshmallows and sprinkles.


  • For vibrant colors, use gel food coloring.
  • Layer colors gently to avoid mixing and muddying.
  • Decorate with marshmallows just before serving to prevent them from getting soggy.


Q: Can I make this cake a day ahead?
A: Yes, you can prepare and bake the cake a day in advance. Add frosting and decorations on the day of serving to keep everything fresh.

Q: What if I don’t have gel food coloring?
A: Liquid food coloring can be used but may not be as vibrant. You might need to use more to achieve bright colors.

Prep Time: 20 minutes

Cook Time: 30 minutes

Total Time: 50 minutes

Yield: 12 servings

Category: Dessert

Method: Baking

Cuisine: American

Diet: Vegetarian


The Rainbow St. Patrick’s Day Cake is a festive, colorful, and delicious way to celebrate St. Patrick’s Day or bring some cheer to any day of the year. Its easy preparation and eye-catching appearance make it an excellent choice for both novice and experienced bakers looking to make a special treat. Enjoy crafting and sharing this delightful dessert at your next gathering!

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