Divide the oil between 2 large saute pans and heat over high heat until almost smoking. Add 2 chicken breasts to each pan and cook until golden brown on both sides, about 2 minutes per side. Transfer to a baking sheet and top each breast with some tomato sauce, a few slices of the mozzarella, salt and pepper, and a tablespoon of Parmesan. Bake in the oven until the chicken is cooked through and the cheese is melted, about 5 to 7 minutes. Remove from the oven and garnish with basil or parsley leaves.
