Chocolate Covered Potato Eggs

Boil and mash potatoes, then cool to room temperature. Add butter to potatoes. Mix potatoes , sugar, and vanilla extract, and chill in the refrigerator for 1 hour. The mixture should be the consistency of marzipan . Divide into 16 equal pieces and roll into egg shapes. Freeze them for 30 minutes. Dip pieces into melted chocolate to cover, transfer to a rack for the chocolate to harden. Serve cold.