Start by baking the rolls according to the package directions.
Then, slice them in half.
Cut the grilled, jumbo hot dogs in half across, then cut in half lengthwise and open it. Place each on the bottom half of the Roll.
Top each with a spoonful of hot chili and a slice or two of cheddar cheese.
Place them onto a baking sheet and set it the warm oven just until the cheese starts to melt. Top with diced onions, if desired.