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Lucky Charms Marshmallow Cake

A magical, vibrant, and fun St. Patrick's Day dessert featuring moist vanilla cake layers, fluffy buttercream, and a solid exterior of colorful cereal marshmallows.
Print Recipe
Prep Time 45 minutes
Cook Time 35 minutes
Total Time 1 hour 20 minutes
Servings: 12 slices
Course: Cake, Dessert
Cuisine: American, Holiday
Calories: 680
Ingredients Equipment Method Notes

Ingredients
  

Vanilla Cake Base
  • 2.5 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 tbsp baking powder
  • 0.5 tsp salt
  • 1 cup unsalted butter room temperature, cut into cubes
  • 4 large eggs room temperature
  • 1 cup buttermilk room temperature
  • 1 tbsp vanilla extract
Frosting & Decoration
  • 1.5 cups unsalted butter softened
  • 4.5 cups powdered sugar sifted
  • 0.25 cup heavy cream
  • 1 tbsp vanilla extract
  • 4-5 cups Lucky Charms marshmallows sorted from the cereal

Equipment

  • Two 8-inch round cake pans
  • Stand mixer or hand mixer
  • Mixing bowls
  • Spatula

Method
 

  1. Preheat oven to 350°F (175°C). Grease, flour, and line two 8-inch cake pans with parchment paper.
  2. In a mixer, combine flour, sugar, baking powder, and salt. Add cubed butter slowly until the mixture resembles coarse sand.
  3. Whisk eggs, buttermilk, and vanilla together. Add half to the dry ingredients and mix for 1 minute. Add the rest and mix until just combined.
  4. Divide batter into pans and bake for 30-35 minutes. Let cool completely on wire racks.
  5. For the frosting, beat softened butter until pale and fluffy. Gradually add powdered sugar, cream, and vanilla until smooth and spreadable.
  6. Sort the marshmallows from the cereal pieces, reserving the cereal for another use.
  7. Frost the cooled cakes, stacking them and covering the entire outside with a thick layer of buttercream.
  8. Immediately press the sorted marshmallows tightly into the frosting all over the top and sides of the cake. Serve and enjoy!

Notes

Sorting the marshmallows takes time, so enlist help or do it a day ahead and store in an airtight container.