In a small bowl, mix together ancho chile powder, paprika, cayenne pepper, cinnamon, and granulated sugar. Set aside.
Into a mason jar with a lid, add chocolate chunks and 1/4 teaspoon of the spice mixture. Microwave uncovered for 30 to 45 seconds, or until the chocolate has melted slightly. Top with milk and put the lid on the jar. Shake for 60 seconds, or until the milk has foamed up and doubled in size. Remove the lid and microwave for an additional 30 to 45 seconds to heat up the milk.
Pour warmed, frothed milk over instant espresso powder mixed with hot water and garnish with whipped cream and a pinch of the spice mixture. Enjoy immediately.