Preheat Oven: Set your oven to 350°F (175°C). Line two baking sheets with parchment paper and set aside.
Cream Butter and Sugars: In a large mixing bowl, beat the softened butter, light brown sugar, and granulated sugar together using an electric mixer on medium speed for about 2 minutes, or until the mixture is light and fluffy.
Add Egg Yolks and Vanilla: Add the egg yolks and vanilla bean paste (or extract) to the butter-sugar mixture. Beat on medium speed for another 2 minutes, or until the mixture is pale in color and fluffy.
Combine Dry Ingredients: In a separate bowl, whisk together the all-purpose flour, baking powder, baking soda, and kosher salt. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
Fold in Mix-ins: Gently fold in the M&M's, white chocolate chips, pretzel pieces, potato chip pieces, and red and green jimmies using a spatula until evenly distributed throughout the dough.
Scoop Dough: Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
Optional Decoration: For a festive touch, add a few extra M&M's, white chocolate chips, pretzel pieces, and sprinkles on top of each dough ball before baking.
Bake: Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown and the centers have set.
Cool: Allow the cookies to cool on the baking sheets for 5 minutes before transferring them to wire racks to cool completely.