1 can condensed milkCook condensed milk and butter until bottom of pan shows while stirring. Stir in the sifted cocoa powder. Pour into wax lined pan to cool and refrigerate. If you don't let it cool, this will happen to you:
1 T butter
3 T cocoa powder
cocoa powder, sugar, powdered sugar, or sprinkles to roll in
Roll into small 3/4", or really any size you want, balls and coat with your choice of coatings.