Prepare the Batter: In a large mixing bowl, cream together 2 sticks of unsalted butter (room temperature), 1 cup of granulated sugar, and 1 cup of brown sugar until light and fluffy. Beat in 3 large eggs and 1 teaspoon of pure vanilla extract until well combined.

Combine Dry Ingredients: In a separate bowl, whisk together 3 cups of all-purpose flour, 1 teaspoon of baking soda, and 1 teaspoon of salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Add M&M’s and Chocolate Chips: Gently fold in 1 1/2 cups of M&M's and 1 cup of chocolate chips (mini or regular-sized) into the batter until evenly distributed.

Preheat Air Fryer: Preheat your air fryer to 325°F (160°C) for a few minutes.

Prepare Baking Dish: Grease a baking dish that fits into your air fryer basket and pour the brownie batter into it, spreading it out evenly.

Air Fry: Place the baking dish into the preheated air fryer basket and cook the brownies at 325°F (160°C) for about 25-30 minutes, or until a toothpick inserted into the center comes out clean.

Cool and Serve: Once the brownies are cooked, remove them from the air fryer and let them cool in the baking dish for a few minutes before slicing into bars. Serve and enjoy your delicious M&M’s Brownies!