First, combine powdered sugar and coconut. Then, add the potatoes. It is a little hard to mix but all at once, it starts to blend more readily.
Roll into small balls, about 1 1/2 inches in diameter.
Place on wax-paper covered tray.
Melt in top of double boiler and stir until smooth. Dip balls in chocolate mixture to coat. Keep the mixture warm over the hot water. Otherwise, it will thicken and harden. (Hint: Use a bamboo skewer to poke the balls and dip them into the chocolate.)
Keep in airtight container and store in refrigerator.