1 can sweetened condensed milk
1/2 stick of butter or margarine
(you can use only 1 Tbsp and it will still work)
2 heaping Tbsp of Nestlé's Quick

In a heavy saucepan mix chocolate with condensed milk and add the margarine

Cook on low heat, stirring constantly until you can see the bottom of the pan. Continue to stir for another two minutes.

Pour onto a plate and let cool completely before you form the little balls (I usually leave it in the cupboard until next day). Butter your hands slightly before forming the dough. Roll the balls in chocolate powder or jimmies and put them in small paper cups.

A little cultural note: Have you noticed how many Brazilian recipes are made with condensed milk? Condensed milk came to Brazil from Switzerland over a hundred years ago. It's made by Nestlé —and because the label featured the picture of a milkmaid, the cans became known as the "maid's milk". In Brazil, to this day, that's what condensed milk is called: (Leite Moça).