In a large pot or dutch oven, add uncooked ground beef, 1 cup chopped onion, garlic, beef broth, tomato sauce, tomato paste, apple cider vinegar, brown sugar, cocoa powder, chili powder, cumin, and cinnamon. Stir to combine.

Bring to boil, reduce heat to simmer uncovered for 1 hour or until chili has reduced and thickened.

Over medium heat, add water to a skillet enough to cover the surface with half an inch of water. Add hot dogs and cook 3 minutes.

To steam hot dog buns: Place 2 skewers over top of skillet. Open hot dog buns and place over skewers to steam buns for 1 minute.

Serve on steam hot dog bun, add cooked hot dogs, mustard, Cincinnati chili, reserved chopped onions, and mounds of cheese.