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M&M'S Christmas Cookie Bars

M&M’s Christmas Cookie Bars are the ultimate holiday treat—soft, chewy, buttery, and bursting with the perfect mix of festive add-ins like Oreo pieces, Christmas M&M’s, and melty chocolate chips. Baked as bars instead of individual cookies, they save time without sacrificing flavor, making them ideal for busy holiday schedules. With a warm vanilla cookie base, pops of colorful chocolate candy, and delicious cookie crunch, these bars slice beautifully and bring instant Christmas cheer to any dessert table. They’re perfect for parties, cookie exchanges, edible gifting, or cozy family baking traditions, delivering crowd-pleasing flavor in every bite.
Prep Time10 minutes
Cook Time30 minutes
Total Time40 minutes
Servings: 16

Ingredients

  • Cooking spray
  • 3/4 cup 1 1/2 sticks butter, softened
  • 1 cup granulated sugar
  • 1/2 cup packed brown sugar
  • 2 large eggs
  • 2 tsp pure vanilla extract
  • 2 cups all-purpose flour
  • 3/4 tsp baking powder
  • 1/2 tsp kosher salt
  • 8 Oreos crushed
  • 1/2 cup Christmas M&M’s
  • 1/2 cup semisweet chocolate chips

Instructions

  • Preheat oven to 350°F and grease a 9x9-inch pan with cooking spray.
  • In a large bowl, beat butter, granulated sugar, and brown sugar until light and fluffy.
  • Add eggs and vanilla; mix until fully combined.
  • In a separate bowl, whisk flour, baking powder, and salt.
  • Add dry ingredients to the wet mixture and beat until just combined.
  • Fold in crushed Oreos, M&M’s, and chocolate chips.
  • Press dough evenly into the prepared pan.
  • Bake 25–30 minutes until golden and slightly soft in the center.
  • Let cool completely, then slice into squares.

Notes

Ingredient Substitutions

  • Use holiday-themed Oreos for extra color.
  • Swap semisweet chips for white chocolate or milk chocolate.
  • Add chopped walnuts or pecans for crunch.

Make-Ahead Tips

  • Bars stay soft for 3–4 days when stored airtight.
  • Freeze sliced bars for up to 2 months.
  • Dough can be prepared 24 hours ahead and chilled.

Serving Variations

  • Drizzle with melted white chocolate for a festive finish.
  • Top with holiday sprinkles before baking.
  • Serve warm with vanilla ice cream for a decadent treat.

Avoid Mistakes

  • Don’t overbake—edges should be lightly golden but center slightly soft.
  • Press dough evenly to ensure uniform thickness.
  • Let bars cool fully before slicing to prevent crumbling.