In large bowl, beat sugar and margarine until creamy. Add eggs and milk; beat well. Add combined oats, flour, baking powder, baking soda, cinnamon and salt; mix well. Cover; chill about 2 hours. Heat oven to 375°F. Roll dough into 1-1/2-inch diameter balls. Place 3 inches apart on ungreased cookie sheet. Insert a flat wooden stick into side of each ball of dough. Using bottom of glass dipped in sugar, flatten to form 2-3/4-inch diameter circles. Bake 14 to 16 minutes or until edges are light golden brown. Cool 1 minute on cookie sheet; remove to wire rack. Cool completely. Decorate as desired with frosting and candies.