Get Ready to Bake: Preheat your oven to 350°F (175°C). For the best results and easy cleanup, line two baking sheets with parchment paper.
Combine Dry Goodness: In a medium bowl, gently whisk together the flour, baking soda, and salt until they're well combined. Set this aside for a moment.
Cream the Sweet Base: In a large bowl, use an electric mixer to beat the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy. This usually takes a couple of minutes.
Add Flavorful Liquids: Mix in the egg and vanilla extract on low speed until they are just incorporated into the creamy sugar mixture.
Gently Mix in Dry INGREDIENTS : Gradually add the flour mixture to the wet ingredients, mixing on low speed only until everything is just combined. Remember, it's key not to overmix to ensure your cookies stay tender and chewy.
Fold in the Festive Fun: Stir in the semi-sweet and white chocolate chips, along with the holiday sprinkles, until they're evenly distributed throughout the dough. Then, gently fold in the vibrant red and green M&M's.
Scoop & Prepare for Baking: Using a cookie scoop or a heaping tablespoon, drop rounded portions of dough onto your prepared baking sheets, leaving a little space between each cookie for spreading.
Bake to Golden Perfection: Bake the cookies, one sheet at a time, for about 8-13 minutes. They're perfectly done when the edges are lightly golden and the centers look set.
Cool & Enjoy: Let the delicious cookies cool on the baking sheets for about 5 minutes. This helps them firm up. Afterward, carefully transfer them to a wire rack to cool completely before enjoying your festive treats!