Double Chocolate Chip M&M Cookies
- To top the cookies: about 1 cup mini m&ms, about 1 cup semi-sweet chocolate chips
- 1 egg
- 1 tsp vanilla extract
- 1/2 stick unsalted butter, softened (1/4 cup)
- 3/4 cup brown sugar
- 1 cup all purpose flour
- 1/4 tsp salt
- 1/4 cup cocoa powder
- 1/2 tsp baking soda