Preheat oven to 350 degrees. Lightly grease a 9x13-inch baking dish. Tear up the hot dog buns and arrange the pieces in the bottom of the dish evenly. Slice the hot dogs into bite size pieces and layer the pieces over the buns. Pour the chili over the hot dogs, sprinkle with the chopped onion, then spread some mustard over the chili and onion. Top off with the cheese. Bake for 30 minutes.
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