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Lucky charms cookie dough squares

Lucky Charms cookie dough squares

A magically delicious dessert that has three layers. A sweet and buttery cereal crust, a cough dough center with marshmallows and a colorful buttercream topping!
Prep Time 20 mins
45 mins
Total Time 1 hr 5 mins
Course Dessert
Cuisine American
Servings 12 people
Calories 803 kcal


  • Mixing bowls
  • Electric hand mixer
  • Stand mixer fitted with paddle attachment
  • spatula
  • Wilton brownie pan
  • Measuring cups and spoons
  • Food processor


Buttery cereal crust

  • 4 cups oats from Lucky Charms cereal
  • ¼ cup light brown sugar
  • 1 tsp vanilla extract
  • ½ cup unsalted butter melted

Cookie dough

  • ¾ cup unsalted butter room temperature
  • cup granulated sugar
  • tbsp vanilla extract
  • pinch of salt
  • 2 cups Lucky Charms marshmallows
  • 2 cups all-purpose flour
  • ¼ cup heavy cream

Colorful buttercream frosting

  • 1 cup unsalted butter room temperature
  • 4 cups confectioner's sugar
  • pinch of salt
  • 1 tbsp vanilla extract
  • ¼ cup heavy cream
  • pink food coloring
  • green food coloring
  • blue food coloring


Buttery cereal crust

  • Lightly spray the brownie pan with non stick spray. Set aside. Add cereal oats to the food processor. Pulse until the mixture turns to fine crumbs. Pour mixture in a large bowl and add the brown sugar and melted butter. Stir until well combined.
  • Press mixture firmly into each brownie cavity. Place the pan in the freezer for at least 30 minutes.

Cookie dough

  • In a large mixing bowl and with an electric mixer, cream the butter and sugar together until light and fluffy. Add in the vanilla and salt and blend until combined. Fold in about 1½ cups of marshmallows.
  • Slowly add in flour 1 cup at a time until well combined. Slowly pour in the heavy cream until the dough comes together.
  • In a stand mixer fitted with paddle attachment, cream together all the ingredients for the frosting until smooth or desired consistency has been reached. Divide frosting between 3 bowls and add each food coloring until you have three colors.
  • Remove pan from freezer and press cookie dough into each cavity almost to the top. Frost each cavity with colored buttercream with offset spatula and top with marshmallows. Put in fridge for 30 minutes.
  • Remove from fridge and cut out each individual square by running a knife around each cavity. Serve and enjoy!


  • Bake flour for 5 minutes on a baking sheet to prevent food borne illness. 
  • Keep squares in an airtight container in the fridge.


Serving: 12peopleCalories: 803kcalCarbohydrates: 105gProtein: 7gFat: 40gSaturated Fat: 25gTrans Fat: 1gCholesterol: 105mgSodium: 52mgPotassium: 163mgFiber: 4gSugar: 67gVitamin A: 1379IUVitamin C: 2mgCalcium: 65mgIron: 4mg
Keyword Lucky charms, marshmallows, cereal, St. Patty's Day
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