Roll the pizza crust on a flat surface. Use a rolling pin to thin it out into a rectangle and use a pizza cutter to cut the center both horizontally and vertically, creating four smaller rectangles.

To one side of each piece of dough add yellow mustard and/or onion if desired, some of the sliced hot dogs. cold chili, and shredded cheese.

Note: Cold chili will be less likely to run off the crust, stuff as much chili and cheese that you can fit. Very full calzones may leak some chili as they cook, but you can serve any extra chili on the baking sheet scooped over top of the calzones.

Fold the empty side over the filled side and press the seams shut. Use a fork to press down on the seams to make sure they don't open during baking, I pressed a few times on each calzone.

Place the calzones on a lined baking sheet and brush the melted butter over each calzone. Bake in a 400 degree oven for 14 to 18 minutes. Remove from the oven when the crust is cooked how you prefer.

Serve with hot sauce and/or oyster crackers if desired.