1. Preheat the oven to 350°F and line two baking sheets with parchment paper.

2. In a large bowl, beat the softened butter, creamy peanut butter, brown sugar, and granulated sugar until light and fluffy.

3. Add the eggs and vanilla extract, then mix until fully combined.

4. Stir in the flour, baking soda, and salt just until the dough comes together.

5. Fold in the chocolate chips and Christmas M&Ms, reserving a few candies for the tops if desired.

6. Scoop the dough into evenly sized balls and place them on the prepared baking sheets about 2 inches apart.

7. Press a few extra M&Ms on top of each dough ball for a festive look.

8. Bake for 10 to 12 minutes, until the edges are set and the centers are still slightly soft.

9. Let the cookies cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.