1/4 cup coarsely chopped Mexican chocolate (preferably Abuelita brand)
pinch ground chipotle chile powder
Heat waffle iron.
Spread butter on one side of both slices of bread. Flip bread over and sprinkle chocolate all over one slice. Sprinkle with cinnamon and chile powder, then top with the other slice of bread, butter-side out.
Place in waffle iron and close, pressing down a bit. Let cook until bread is toasted and chocolate is melted, about 3 minutes.