In a sauce pan, combine the first 5 ingredients.
Mix well using a wire whisk until no lumps from the jam are visible.
Turn on heat and bring to a boil, then continue cooking in a simmering stage until mixture thickens.
Remove from the heat and cool. Once cooled, mix in the powdered milk and quezo de bola until it forms a dough.
Use a small amount of ube pastillas dough and roll into a log. Then roll in white sugar and wrap.