1. Heat milk, cocoa powder, and sugar over medium-low heat in a pot, stirring frequently.
2. Once milk mixture is warm, but not boiling, add chocolate chips and stir continuously until they melt, approximately 3 to 5 minutes.
3. Once you have your hot chocolate, add in the vanilla extract, stirring to combine for a couple of minutes.
4. Then serve your hot chocolate in your favourite mugs, with a cinnamon stick, and enjoy!