| 1 cup butter | 2 ½ cups flour |
| 1 cup packed brown sugar | 1 tsp baking soda |
| ½ cup white sugar | 1 tsp salt |
| 2 eggs | 1 ½ cups M&Ms |
| 1 ½ tsp vanilla extract |
Preheat the oven to 350°F.
Beat butter, brown sugar, white sugar, eggs, and vanilla in a mixing bowl until light and fluffy, 2 to 3 minutes.
Add flour, baking soda, and salt; blend well. Stir in ½ of the M&Ms.
Drop by teaspoonfuls onto an ungreased baking sheet. Use remaining M&Ms to decorate dough balls; press down slightly.
Bake in batches in the preheated oven until lightly browned with soft centers, 9 to 11 minutes.