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Soft & Chewy Christmas M&M Cookie Bars

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4.3 from 73 reviews

Delight in these soft and chewy Christmas M&M cookie bars, bursting with festive red and green M&Ms, rich brown sugar, and melty chocolate chips. Perfectly buttery with a tender center, these bars make an ideal holiday treat for parties, cookie exchanges, or last-minute baking delights.

Ingredients

Scale

Wet Ingredients

  • 1 cup unsalted butter, melted
  • 2 large eggs
  • 1 tbsp vanilla extract

Dry Ingredients

  • 1 cup brown sugar
  • ½ cup granulated sugar
  • 2 ½ cups all-purpose flour
  • 1 tsp baking soda
  • ½ tsp salt

Add-ins

  • 1 cup Christmas M&Ms
  • ½ cup chocolate chips

Instructions

  1. Preheat Oven and Prepare Pan: Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper for easy removal.
  2. Mix Wet Ingredients: In a large bowl, whisk the melted unsalted butter with brown sugar and granulated sugar until the mixture is smooth and combined.
  3. Add Eggs and Vanilla: Beat in the two large eggs and the tablespoon of vanilla extract until fully incorporated and smooth.
  4. Combine Dry Ingredients: Gradually fold in the all-purpose flour, baking soda, and salt until just combined. Be careful not to overmix to keep the cookie bars soft and chewy.
  5. Fold in M&Ms and Chocolate Chips: Stir in the festive Christmas M&Ms and chocolate chips evenly throughout the dough.
  6. Press Dough into Pan: Transfer the dough into the prepared baking pan, pressing it evenly to create a uniform layer for consistent baking.
  7. Bake the Bars: Bake in the preheated oven for 22 to 25 minutes, or until the edges are set and golden while the center remains softly cooked.
  8. Cool and Slice: Allow the cookie bars to cool completely in the pan before slicing into squares to ensure clean cuts and the perfect chewy texture.

Notes

  • For an enhanced chewy texture, avoid overbaking; the center should still look slightly soft when pulled from the oven.
  • Using parchment paper makes cleanup easier and prevents sticking.
  • Store cookie bars in an airtight container at room temperature for up to 5 days to keep them fresh.
  • Feel free to substitute the Christmas M&Ms with regular or peanut M&Ms according to preference.