Preheat oven to 400 degrees
Spray baking sheet with non stick spray and place aside
Roll out the pizza crust, and cut into 6 equal-sized squares
In the middle of each square, place a portion of marinara sauce, shredded mozzarella cheese, and 5 pepperoni slices
Fold the dough over into a triangle, and use a fork to press along the edges to seal them closed
Brush the top of each calzone with melted butter, then sprinkle with Italian seasoning
Place calzones on the prepared baking sheet
Place in the oven and bake for 10 minutes, or until tops are golden brown
Serve with warm pizza sauce for dipping
Enjoy!