In a large heavy bottomed saucepan, bring milk, cocoa powder, vanilla, cinnamon and cayenne to a simmer over medium low heat.

Simmer for 5 minutes until thoroughly warmed through.

Add chocolate chips and whisk vigorously until smooth.

Remove from heat and divide between four glasses.

Serve with cinnamon sticks in each glass to be used as a stir stick. Add a splash of coffee or chocolate liqueur to each serving, if desired.