Powdered Sugar Cookies
["2 c. flour", "1 tsp. cream of tartar", "1 c. soft butter", "1 c. powdered sugar", "1 egg, well beaten"]
["Mix well.", "Roll in small balls and press down slightly with a fork that has been dipped in water.", "Bake at 350\u00b0 for 10 minutes. While still quite warm, roll in powdered sugar."]
["flour", "cream of tartar", "butter", "powdered sugar", "egg"]