preheat oven to 350°f

spray 9x13 baking dish with nonstick cooking spray

break buns into pieces and cover bottom of dish with the pieces

slice hot dogs into bite sized pieces and layer on top of buns

chop up the onion and layer over the hot dogs

squirt mustard over dish (to your tasting)

spread can of chili over the previous layers

sprinkle with cheddar cheese

bake in oven for 25 minutes