To make no-cook pastillas, combine 2 cups powdered milk and 14 ounces condensed milk in a mixing bowl. Once the mixture is completely combined without any lumps, add 1 tbsp margarine and mix well. Then, using your hands or a scoop, shape your pastillas into a ball or cylinder, and roll them in the sugar. Immediately wrap the pastilles in cellophane and twist the ends tightly to keep the candy from drying out. For information on cooking pastillas over a fire, read on!