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Thick and chewy Christmas cookie bars stacked on a baking sheet with holiday M&Ms and melted chocolate.

Chewy Christmas Cookie Bars

Soft, buttery Christmas cookie bars loaded with holiday M&Ms and chocolate chips. An easy one-pan Christmas dessert with golden edges and chewy centers.
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Ingredients Method Notes

Ingredients
  

  • ¾ cup unsalted butter melted and cooled slightly
  • 1 cup packed brown sugar
  • ½ cup granulated sugar
  • 1 large egg
  • 1 large egg yolk
  • 1 tablespoon vanilla extract
  • 2¼ cups all-purpose flour
  • 1 teaspoon baking soda
  • ½ teaspoon salt
  • 1 cup holiday red and green M&Ms divided
  • 1 cup semisweet chocolate chips divided

Method
 

  1. Preheat oven to 350°F. Line a 9×13-inch baking pan with parchment paper.
  2. Whisk melted butter, brown sugar, and granulated sugar until smooth.
  3. Add egg, egg yolk, and vanilla. Mix until combined.
  4. Fold in flour, baking soda, and salt until a soft dough forms.
  5. Stir in ½ cup M&Ms and ¾ cup chocolate chips.
  6. Press dough evenly into the prepared pan.
  7. Sprinkle remaining candies and chocolate chips over the top.
  8. Bake for 22–25 minutes until golden around the edges and set in the center.
  9. Cool completely before slicing into 16 bars.

Notes

Avoid overmixing and overbaking. Store in an airtight container at room temperature for up to 5 days or freeze for up to 3 months.