Warm a medium or large skillet over medium heat. Butter each piece of bread on one side. When skillet is hot place a piece of bread butter side down on the skillet then add one slice of cheese and a small shake of parmesan cheese if desired.
Top with a desired amount of pepperonis i used about 8-10 whole regular pepperonis per sandwich.
If any other toppings are desired add them now. Add another slice of mozzarella and top with a slice bread butter side up. Repeat with the second sandwich.
When bottom slice is golden brown flip over carefully. Once both sides are brown remove from pan and cut and serve with pizza sauce if desired.