Heat oven to 350°F. On ungreased cookie sheet, place dough rounds 2 inches apart. Bake 10 to 12 minutes or until edges are light golden brown. Meanwhile, slightly flatten marshmallows.
Remove from oven, and top each cookie with marshmallow. Return to oven, and bake 1 to 2 minutes or until slightly softened.
Remove cookies from cookie sheets; cool completely on cooling racks.