1 cup unsalted butter, room temperature
1 cup light brown sugar, packed
½ cup granulated sugar
2 large eggs, room temperature
2 teaspoon vanilla extract
3 cups flour
1 teaspoon baking soda
1 teaspoon salt
1 cup Christmas M&M’s
1 cup semi-sweet chocolate chips
⅓ cup Christmas sprinkles
Preheat the oven to 350 F and line a 9×13 baking dish with parchment paper.
Using a stand mixer or hand mixer with a large bowl, beat the butter, brown sugar, and granulated sugar. Mix in the eggs and vanilla until combined.
In a medium bowl, whisk to combine the flour, baking soda, and salt. Gradually mix the dry ingredients into the wet until just combined.
Fold in about ¾ of the M&Ms, chocolate chips, and sprinkles.
Press the dough into the prepared baking dish. Top with the remaining M&M’s, chocolate chips, and sprinkles, pressing them down slightly into the top of the dough.
Bake for 20-25 minutes or until edges are light brown. Allow to cool completely before cutting into bars and serving.
Store in an airtight container at room temperature for up to 4 days.
For longer storage, you can freeze the cooled bars for up to 3 months.