1Cream together sugar and butter. Add milk and stir. Bring to a boil and cook 3 minutes. Remove from heat and add marshmallows, stir in 1 and 3/4 cups of graham cracker crumbs until thoroughly blended. If mixture appears too runny, add the remaining 1/4 cup crumbs. Drop by tablespoon onto wax paper. If mixture appears too dry before all cookies have been made, add a little more milk and blend again then spoon out remaining cookies.