Prepare the Cookie Dough

• Preheat the oven to 350°F (175°C). Line two baking sheets with parchment paper.
• In a large bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy.
• Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
• In a separate bowl, whisk together the flour, baking soda, baking powder, salt, and cornstarch.
• Gradually add the dry ingredients to the butter mixture, mixing just until a soft dough forms.

Add the Christmas Mix-Ins

• Gently fold in the chocolate candies, semi-sweet chocolate chips, white chocolate chips, crushed pretzels, holiday sprinkles, toffee bits, and crushed potato chips.
• Reserve a few candies and chocolate chips to decorate the tops of the cookies.
• Cover the dough and refrigerate for 30 minutes to help prevent the cookies from spreading too much.

Shape and Bake

• Scoop the dough into balls, about 2 tablespoons each, and arrange them on the prepared baking sheets, leaving enough space between each cookie.
• Press a few reserved candies and chocolate chips onto the tops.
• Bake for 10–13 minutes, or until the edges are lightly golden and the centers still look slightly soft.
• Let the cookies cool on the baking sheets for 5 minutes before transferring them to a wire rack.

Cool and Serve

• Allow the cookies to cool completely so the chocolate can set and the centers can firm up.
• Serve with a glass of milk or arrange them on a festive Christmas cookie platter.