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 the flour mixture and mix until it is fully combined. Fold in the M&Ms. Evenly press the cookie dough into a 8-inch square baking dish and bake for 20-25 minutes.