Soften butter to room temperature, beat butter until fluffy, add 1 cup sugar, eggs, milk, and vanilla. Keep beating as you add these ingredients. Sift flour, baking powder and salt together. Add flour mixture and egg and butter mixture. Knead until well blended. Shape cookies into a figure 8 (roll into long snake shape then into figure 8). Place on oiled cookie sheet 2 inches apart. Bake at 350 degrees for 20 minutes. Then roll them in powdered sugar until coated.