Preheat the oven to 350℉. Using a baking spray with flour, spray the bottom and sides of a 9x13-inch baking pan.
Baking Spray with Flour
Using an electric mixer, combine the chocolate chip cookie mix, butter, and egg.
1 pouch Chocolate Chip Cookie Mix, 17.5 oz size, 1 stick Unsalted Butter, 1 Large Egg
Stir in the remaining ingredients. Spread the dough into the prepared pan using clean hands.
½ cup Oreos, coarsely chopped, ½ cup M&M Candies, I used the Holiday Mix, ½ cup Mini Pretzel Twists, coarsely crushed, 2 tablespoons Christmas Sprinkles
Bake for 18 to 22 minutes or until a toothpick inserted in the center comes out clean. Cool completely in the pan on a wire rack. Cut into 24 servings.