Preheat oven to 375 degrees Fahrenheit. Grease the baking sheet. Then, using a medium cookie scoop
(holds about 1.5 tablespoon of dough) begin scooping the cookie dough and placing it on the baking sheet (keeping them about 2-inches spaced apart). Once all the cookies are placed on the baking sheet begin to add 2-3 mini marshmallows per cookie--flattening them into the cookie. Place the remaining dough in the refrigerator while the first batch of cookies bake.