Rainbow Cookies

There’s something about rainbows that just bring out the fun!

We love these rainbow cookies because they are super bright and festive, perfect for St. Patrick’s Day or rainbow themed birthday parties.

These cookies are super easy to make. You can make your sugar cookies from scratch, use cut and slice, store bought dough or pre-made cookies from your bakery then all you have to do is decorate. Decorating these cookies is so much fun. Trust me, the kids will have so much fun helping roll out the fondant and build each rainbow. They’ll have even more fun eating them. These Rainbow cookies were gone in a day at our house!

Rainbow Cookies

Course Dessert
Cuisine American
Servings 12 cookies
Author Jennifer Grooms


  • Your favorite recipe for sugar cookies enough to make at least one dozen 3-inch circular cookies
  • Circle cookie cutter 3 inches in diameter
  • ½ stick butter softened
  • 1 cup icing sugar
  • 1-2 tbsp milk
  • 2 drops sky blue gel food coloring
  • 2-3 oz. red fondant
  • 2-3 oz. orange fondant
  • 2-3 oz. yellow fondant
  • 2-3 oz. green fondant
  • 2-3 oz. blue fondant
  • 2-3 oz. violet fondant
  • 24-40 mini marshmallows


  1. Preheat your oven according to your cookies recipe directions. Line a cookie sheet with parchment paper.
  2. Roll out your sugar cookie dough so that it’s about ¼ of an inch thick. Using your cookie cutter, cut out 12 circles.
  3. Place each cookie on lined cookie sheet and bake according to recipe’s directions.
  4. Allow the cookies to cool completely on a cooling rack.
  5. In a small bowl, beat together butter, icing sugar and milk using an electric mixer. These ingredients will make up your buttercream frosting.
  6. Once the ingredients are well-combined, smooth and form semi-stiff peaks, add blue gel food coloring.
  7. Mix until it’s completely tinted.
  8. Use an offset spatula to frost each cookie.
  9. Now, it’s time to create your fondant rainbow. Start with your red and work your way to the violet fondant, in the order listed above.
  10. Grab a small portion of your red fondant, and roll out a strip, about 3 inches long. Arch it on top of one of your cookies.
  11. Do the same with the rest of your colors, placing it just below its appropriate color. Trim on the sides where you see necessary. Repeat for every cookie.
  12. Place 2-3 mini marshmallows at either end of your fondant rainbow.
  13. Enjoy!

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