Heat up the prepared chili and nacho cheese sauce in two separate bowls via microwave or alternate method.
Dice onion and shred cheese, if using.
Grill the hot dogs using desired cooking method.
To assemble each hot dog, place on a potato roll then top with 1/4 cup prepared chili, 1/4 cup nacho cheese sauce, 1 Oz. shredded cheese, and 1 T diced onion (if desired).