Preheat your oven to 350°F. Line baking sheets with parchment paper or silicone baking mats.

In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.

In a large bowl, beat the butter, granulated sugar, and brown sugar with an electric mixer on medium speed until light and fluffy, about 2-3 minutes.

Add the vanilla extract and eggs, one at a time, beating well after each addition.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Gently fold in the Christmas M&M's and semi-sweet chocolate chips.

Drop rounded tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart.

Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden but the centers are still soft.

Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.