Beat butter,granulated sugar,egg and vanilla in large bowl until well blended.Stire together flour,baking soda and salt; add alternately with milk to butter mixture,beating until well blended
Shape dough into 1-inch balls. Roll in red sugar,granulated sugar,powdered sugar or a combination of any of the sugars. Place on ungreased cookie sheet.
Bake 8 to 10 minutes or until edges are lightly browned and cookie is set.Remove from oven; cool 2to 3 minutes.Press a candy piece into center of each cookie.Remove from cookie to wire rack. Cool completely. About 4 dozen cookies.