Brigadeiro

1 (14 ounce) can sweetened condensed milk
1 tablespoon butter
3 tablespoons cocoa
chocolate sprinkles

1. Over medium-low heat, stir vigorously the three ingredients.
2. Cook the mixture until it thickens enough to show the pan bottom during stirring (it will be firm enough to stay together and not spread) Pour into a greased dish and let cool to room temperature (or chill a few minutes in the fridge) Grease your hands with butter and take small amounts of candy and form into 1 1/2 inch balls.
3. Roll the balls in chocolate jimmies to decorate.
4. If the balls don't hold their shape, cook an additional 5 minutes until it thickens up more.