Mix potatoes plain mashed (no butter, milk or salt added) and confectioners sugar. Stir in coconut, vanilla and salt. Blend well. Press into one large or two small pans, so that candy is about 1/2 inch thick. Melt chocolate in double boiler, on low heat, do not allow water to boil. Pour over top of candy and cool in refrigerator. Cut in Bite size squares. For variation you can roll in balls, and roll in cinnamon for Pattys'day or shape in 1 inch high cones, and dip base in chocolate. Forming little haystacks. Yeilds about 100 haystacks.