Preheat the oven to 375 degrees.
Lay a bit of flour out on a clean dry surface.
Roll the defrosted dough out into a rectangular or oval shape about ¼ of an inch thick.
Layer the mozzarella along the top of the dough.
Place a layer of pepperoni slices on top of the cheese.
Starting at one end, roll the dough into a log with the cheese and pepperoni on the inside.
Place the bread onto a parchment or silicone mat-lined baking sheet, and brush with the melted butter.
Bake for 25-30 minutes until cooked through and browned on top. Slice and serve.