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Lucky Charms Sheet Cake Recipe

4.9 from 767 reviews

This Lucky Charms Sheet Cake is a whimsical and delicious dessert featuring a moist, green-hued cake infused with cereal milk and loaded with the magic of Lucky Charms marshmallows and sprinkles. A fun twist on classic sheet cake, it combines nostalgic cereal flavors with a creamy, sweet frosting, perfect for celebrations or a playful treat.

Ingredients

Scale

Cereal Milk and Cereal

  • 3 cups Lucky Charms
  • 2 cups milk
  • ¾ cup cereal milk (reserved from soaking cereal)

Cake

  • 1 ¼ cups all-purpose flour
  • 1 ¼ teaspoon baking powder
  • 1 Tablespoon cornstarch
  • ¼ teaspoon salt
  • ½ cup unsalted butter (room temperature)
  • 2 Tablespoons vegetable oil
  • ¾ cup granulated sugar
  • 2 large eggs (room temperature)
  • 2 teaspoons vanilla extract
  • Green food coloring (optional)

Frosting

  • ½ cup unsalted butter (softened)
  • 34 cups confectioners sugar
  • 2 Tablespoons cereal milk
  • 1 teaspoon vanilla extract
  • Rainbow sprinkles
  • Reserved Lucky Charms marshmallows

Instructions

  1. Prepare Cereal Milk: Preheat oven to 300ºF. Line a baking sheet with parchment paper or silicone baking mat. Remove marshmallows from 3 cups of Lucky Charms cereal and set aside. Spread the remaining cereal on the baking sheet and bake for 15 minutes, stirring halfway through to toast evenly. Let it cool.
  2. Soak Cereal: Place the toasted cereal in a large bowl and pour in 2 cups of milk. Let it soak for 15 minutes to infuse the milk with cereal flavor. Drain the mixture, reserving the soaked cereal milk and discarding the cereal solids.
  3. Prepare Cake Batter: Preheat oven to 350ºF. Line a 9 x 13-inch baking pan with parchment paper and lightly coat with non-stick spray. In a medium bowl, whisk together flour, baking powder, cornstarch, and salt. In a large bowl, beat butter, vegetable oil, and granulated sugar for about 2 minutes until light and fluffy. Beat in eggs, vanilla extract, and ¾ cup of the reserved cereal milk. Gradually add the dry ingredients, mixing just until incorporated. Add green food coloring if desired to tint the batter.
  4. Bake Cake: Pour the batter evenly into the prepared pan. Bake for 28 to 32 minutes, or until a toothpick inserted into the center comes out mostly clean. Allow the cake to cool completely in the pan before frosting.
  5. Make Frosting: In a large bowl, beat softened butter, 3 cups of confectioners sugar, 2 tablespoons of reserved cereal milk, and 1 teaspoon vanilla extract together for about 2 minutes until smooth and creamy. If the frosting is too thin, gradually add more confectioners sugar by the tablespoon until desired thickness is attained.
  6. Frost and Decorate: Spread the frosting evenly over the cooled sheet cake. Decorate generously with rainbow sprinkles and the reserved Lucky Charms marshmallows for a colorful, fun finish.

Notes

  • Removing marshmallows from the cereal before toasting prevents them from melting and losing their shape.
  • Toasting the cereal intensifies the flavor of the cereal milk.
  • Use room temperature eggs and butter for a smoother batter and frosting texture.
  • Green food coloring is optional but adds a fun, magical color to the cake.
  • If the frosting is too thin, add more confectioners sugar a little at a time to thicken.
  • Store the cake covered at room temperature for up to 2 days or refrigerate for longer freshness.

Keywords: Lucky Charms cake, cereal milk cake, sheet cake recipe, fun dessert, easy baking, colorful cake, marshmallow cake