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