1 (10 oz.) package refrigerated pizza dough
1 1/2 pound flank steak or deli roast beef, thinly sliced
1 cup provolone or American cheese, grated
1 cup mozzarella cheese, grated
3/4 cup white onion, finely chopped
2 tablespoons fresh parsley, chopped
1 tablespoon olive oil, optional
kosher salt and freshly ground pepper, to taste
marinara sauce, garnish
sliced mushrooms and green peppers, optional