In a small saucepan, combine the tomato sauce, Italian seasoning and garlic powder. Bring to a boil. Reduce heat; cover and simmer for 20 minutes., Meanwhile, in a shallow bowl, lightly beat the egg. In another shallow bowl, combine bread crumbs and Parmesan cheese. Dip chicken in egg, then coat with crumb mixture., In a large skillet, cook chicken in oil over medium heat until a thermometer reads 165°, about 5 minutes on each side. Top with mozzarella cheese. Cover and cook until cheese is melted, 3-4 minutes longer. Serve with tomato sauce. If desired, sprinkle with basil and additional parmesan.