Ingredients
Method
- Preheat the oven to 350 F. In a medium bowl, whisk together flour, cocoa powder, salt, and baking soda. In a large bowl, combine butter with both brown and granulated sugar until fluffy.
- Add in the egg and vanilla extract until smooth. Add in the flour mixture, mix until it is fully combined. Fold in the M&Ms. Evenly press the cookie dough into a greased 8-inch square baking dish. Bake for 20-25 minutes.