In a medium pot, mix the cornstarch, condensed milk, evaporated milk, sugar, cinnamon stick, and vanilla extract.

Cook over medium heat, stirring constantly, until the mixture thickens and starts to pull away from the sides of the pot.

Remove from heat and stir in the butter until melted and fully incorporated.

Allow the mixture to cool for a few minutes.

Use a spoon to scoop the mixture and form it into small balls (melcochas).

Place the melcochas onto a baking sheet lined with parchment paper and let them cool completely.

Once cooled, serve and enjoy!