Ingredients
Method
- Cream the butter, peanut butter, granulated sugar, and brown sugar on medium speed until light and fluffy, about 2 minutes.
- Beat in the egg and vanilla just until combined, scraping the bowl once.
- Whisk the flour, baking soda, and salt together, then mix into the butter mixture on low just until no dry flour remains.
- Fold in 1 cup M&Ms, cover, and chill the dough at least 30 minutes.
- Preheat oven to 350°F (180°C). Scoop 1.5-tablespoon portions onto lined baking sheets, bake 10 to 12 minutes until edges are set, then press extra M&Ms on top and cool 5 minutes on the pan before moving to a rack.
Notes
Chill the dough for at least 30 minutes before baking; longer chilling (up to 24 hours) deepens the peanut butter flavor. For the softest cookies, avoid overbaking and let them finish setting on the warm pan.
