Line a microwave-safe plate with 2 sheets of paper towel. Place a few slices of pepperoni on top to cover the plate. Cook on HIGH in a microwave for 30 seconds. Move pepperoni to a clean plate and discard paper towel. Repeat the process until all of the pepperonis are cooked.
PREPARE OVEN AND BAKING SHEETS:
Move the oven racks to the upper middle and lower middle positions. Preheat oven to 400 degrees F. Line 2 baking sheets with parchment paper or silicone baking mats; set aside.
FILL AND PREP THE FOR BAKING:
Lightly flour the counter and divide the dough ball into two 1-pound balls. Cover one dough ball with a clean kitchen towel while you fill and prep the other.
Pat the pizza dough into a 12x10-inch rectangle. Brush the edges of the pizza dough with 1/2 tablespoon of olive oil.
Sprinkle the dough with 1 1/2 cups of shredded mozzarella.
Evenly distribute half of the pepperoni over the cheese.
Sprinkle 1/2 cups of the Parmesan cheese over the pepperoni.
Fold over 1 long side of the dough so that the edge meets in the center of the dough.
Fold over the other long side of the dough and then pinch the seams shut.
Place the stromboli on one of the prepared baking sheets, seam-side down.
In a small bowl combine the egg and 1 tablespoon of water. Brush half of the egg mixture over the stromboli.
Sprinkle the top with 3/4 teaspoon of sesame seeds, and place 5 deep slits into the top of the stromboli. Lightly spray a large piece of foil with nonstick cooking spray and cover the stromboli loosely with the foil. Repeat steps 4-12 with remaining dough ball and ingredients.
Bake the Strombolis for 25 minutes, and then remove the foil and rotate the pans. Bake for an additional 25-30 minutes or until the crusts are golden.
Transfer the strombolis to a wire rack to cool for 5 minutes, Cut each stromboli into 2-inch pieces and serve with pizza sauce for dipping.
If you are using homemade pizza dough for this recipe, them make sure you let the dough rise first before proceeding with the stromboli recipe above.