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Preheat oven to 425°F and line a large sheet pan with parchment paper.
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Divide pizza dough into 4 equal parts and roll each dough ball into a 1/4 inch thick circle.
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On half of each dough circle, add equal parts sauce, yellow onion, green bell pepper, and sliced pepperoni. Make sure to leave a little room around the edges so you can crimp the calzone shut.
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Sprinkle the toppings with equal parts shredded cheese. Then fold the other half of the dough over the toppings and crimp the edges.
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Cut 2-3 air vents into the top of the calzone and place it on to the prepared baking sheet.
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Brush with olive oil and bake for about 15 minutes or until the dough is fully cooked and the calzone is golden brown.
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Serve with warmed pizza sauce for dipping.
