Place chocolate in a bowl. Place chocolate chips or chopped chocolate in a medium, heatproof bowl.

Heat remaining ingredients. Combine cream, milk, extract, espresso powder, cinnamon, and salt in a medium saucepan. Place over medium heat and bring to a boil.

Pour over chocolate and stir. Remove from heat and pour over chocolate. Let sit a couple of minutes then whisk until smooth.

Serve or store for later. Leave at room temperature if using within a few hours or let cool, cover, and refrigerate. To make the sauce pourable again, reheat 15 seconds at a time in the microwave, stirring in-between until pourable.