Preheat the oven to 450-degrees.

Split the sub buns in half and place them on a cookie sheet. (I line mine with Reynold's non-stick aluminum foil to make clean up easier because I always spill cheese onto the pan.)

Spray the top of the sub buns generously with non-stick cookings spray.

Stick the buns into the preheated oven for about five minutes. The bread should just be starting to be lightly golden around the edges and feel lightly toasted to the touch.

Cover with pizza sauce, cheese and desired toppings.

Put the subs back in the hot oven for 8 to 10 minutes until the cheese is melted. (Sometimes for the last minute or two, I turn the broiler on low to get them good and toasting on top, but the recipe works just fine without using the broiler as well.)

Serve as an open-faced or closed sandwich.