1. Preparing Your Baking Pan

Begin by preheating your oven to 350°F (175°C). Line a 9×13-inch metal pan with aluminum foil, making sure to leave an overhang on the sides. This will help you easily lift the bars out of the pan once they are baked. Lightly spray the foil with cooking spray to prevent sticking.

2. Mixing the Batter: Tips for Perfect Consistency

In a large mixing bowl, combine the unsalted butter and packed brown sugar. Using a stand or hand mixer, mix until the mixture is crumbly and well-combined. Add the eggs one at a time, followed by the vanilla extract. Continue mixing until the batter is smooth and creamy.

Next, add the salt and baking powder, and mix until just incorporated. Gradually add the all-purpose flour to the mixture, mixing slowly to avoid overmixing, which can result in tough cookie bars. The dough should be thick but still spreadable.

3. Adding the Festive Touch: M&Ms and Sprinkles

Gently fold in the Christmas M&Ms and sprinkles. These colorful additions bring a festive look and extra flavor to the bars. Save a handful of M&Ms and sprinkles to sprinkle on top before baking for an extra festive appearance.

4. Spreading the Batter Evenly in the Pan

Transfer the dough into your prepared baking pan. Since the dough will be sticky, spray your hands with cooking spray to help press it evenly into the pan. Ensure the batter is spread to all corners and has a smooth, even layer. Sprinkle the remaining M&Ms and sprinkles on top for decoration.

5. Baking Tips: How to Achieve the Perfect Texture

Place the pan in the preheated oven and bake for 22-25 minutes, or until the edges just begin to turn golden. Remember, it’s better to slightly underbake these cookie bars than to overbake them, as they will continue to set as they cool. Once baked, allow the bars to cool completely in the pan before slicing them into squares.