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Lucky Charms Sugar Cookie Bars

These Lucky Charms Sugar Cookie Bars are soft, chewy, and full of nostalgic flavor. A buttery sugar cookie base packed with Lucky Charms cereal and white chocolate chips is topped with fluffy vanilla frosting and colorful marshmallows for the ultimate fun dessert. Perfect for St. Patrick’s Day, parties, or anytime you want a playful sweet treat.
5 from 1 vote
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Course: Dessert
Cuisine: American
Keyword: frosted cookie bars, frosted sugar cookie bars, lucky charms cookie bars, lucky charms frosted sugar cookie bars, lucky charms sugar cookies, st. patricks day cookies, sugar cookie bars
Prep Time: 15 minutes
Cook Time: 22 minutes
Cooling and Frosting: 30 minutes
Total Time: 1 hour 7 minutes
Servings: 18 bars

Ingredients

Cookie Base

  • 1 cup unsalted butter softened
  • 2 oz cream cheese softened
  • 1 cup granulated sugar
  • ¼ cup light brown sugar
  • 1 large egg
  • 1 tsp vanilla extract
  • 1 tbsp orange juice
  • 2 cups all-purpose flour
  • 2 tsp cornstarch
  • ½ tsp baking powder
  • Pinch of salt
  • 1 cup Lucky Charms cereal slightly crushed
  • ¾ cup white chocolate chips

Frosting

  • ½ cup unsalted butter softened
  • 2 cups powdered sugar
  • 1 tsp vanilla extract
  • Pinch salt
  • 2 –3 tbsp heavy cream
  • Lucky Charms marshmallows for topping

Instructions

  • Preheat oven to 350°F. Line a 9×13” pan with parchment paper, leaving overhang for easy removal.
  • In a large bowl, beat butter and cream cheese until smooth. Add granulated sugar and brown sugar and beat for 1–2 minutes until fluffy. Scrape down the sides.
  • Add egg, vanilla, and orange juice; mix until incorporated.
  • In a separate bowl, whisk together flour, cornstarch, baking powder, and salt. Gradually mix into the wet ingredients until just combined.
  • Gently fold in Lucky Charms cereal and white chocolate chips. The dough will be slightly soft and sticky.
  • Spread dough evenly into the prepared pan. Bake for 22–25 minutes, until edges are lightly golden and the center is set but soft.
  • Remove from oven and let cool completely in the pan.
  • While cooling, make the frosting. Beat butter until creamy. Gradually add powdered sugar, then vanilla and salt.
  • Mix in heavy cream one tablespoon at a time until fluffy and spreadable.
  • Spread frosting evenly over the cooled bars. Top with Lucky Charms marshmallows.
  • Slice into bars and serve.