Preheat oven to 428℉ or 220℃.
Line a baking pan with a parchment paper, set aside.
Divide the dough into 4 equal parts then roll it into balls. Roll the dough with rolling pin into a ¼ inch thick circle then place pizza sauce, onion, mozzarella cheese, sausage, and pepperoni on half of the dough. Fold in half the dough and crimps the edge.
Place them on baking pan, cut 3 small air vents on top of each calzone then brush with olive oil. Bake for 15 minutes or until golden brown. Serve with pizza sauce, enjoy!