Preheat the oven to 425 degrees Fahrenheit and line a baking sheet with parchment paper.
Divide the pizza dough evenly into 4 different sections. Roll out each section into a dough circle with a rolling pin that’s approximately ¼ inch thick. Place them on the prepared baking sheet.
Spread ½ cup pizza sauce evenly onto each section, leaving a border around the edges.
Top each section with ½ diced red onion, ½ diced green bell pepper, 24 pepperoni slices, and 1 cup shredded mozzarella cheese divided evenly.
Rub a small amount of water onto the outside edge of the dough. Fold the dough over the topping and crimp the edges shut with either your fingers or a fork.
Gently make 3 slices on top of each calzone to allow air to escape while cooking.
Brush the tops with 1 tablespoon olive oil and sprinkle with 1 tablespoon parmesan cheese, ½ teaspoon Italian seasoning, and 1 teaspoon garlic salt.
Bake for 12-14 minutes until golden brown.
Serve warm and enjoy!
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Notes
If you use pizza dough that comes in the sheet form, use a sharp knife to cut out the circles instead of rolling it out again. Make sure that the edges are sealed tightly. The water helps form a tight seal to prevent it from coming apart while cooking it. These are best served fresh but the leftovers can be stored for up to 5 days as long as they are refrigerated in an airtight container.I recommend reheating them in the oven to make the outside crispy again.