Christmas Chocolate Chip Cookies Recipe

Place an oven rack in the middle of the oven and preheat the oven to 375°F (190°C).
In a medium bowl, whisk together the flour, baking powder, and baking soda. Set aside.
In the bowl of a stand mixer, beat the butter at medium speed until creamy, then add the granulated sugar, brown sugar, and salt. Beat until well combined, 2-3 minutes.
Add the egg, egg yolk, and vanilla and mix at low speed until well-combined.
Add the flour mixture and beat together just until combined. Add the chocolate chips, M&Ms, and sprinkles if using. Mix for another few seconds then remove the bowl and stir the dough together with a sturdy spatula or wooden spoon until completely combined.
Form the dough into balls about 2 tablespoons each (I use a cookie scoop). Space cookies about 3 inches apart on your baking sheet. Sprinkle on a little flaky sea salt, if desired, and press two or three more M&Ms in the top.
Bake one cookie sheet at a time for 9-10 minutes, rotating the pan halfway at the 5 minute mark. The cookie tops will be golden brown, the bottoms will be brown, and they'll look puffed and beginning to crinkle when they're ready to be pulled out of the oven.
Remove the cookie pan from the oven and gently flatten each cookie a bit with a flat spatula.
Let the cookies rest for about 5 minutes on the cookie sheet, then transfer to a wire rack to cool completely.