Heat the oil in large skillet over high heat. Add pork strips and stir-fry for 3 to 5 minutes or until no longer pink. Remove from skillet, cover, and keep warm.
Add green beans to the skillet and stir-fry for 1 minute. Add onion and mushrooms. Stir-fry all vegetables for 2 minutes then remove from skillet, cover and keep warm.
In a medium bowl, combine cornstarch, sugar, salt, basil and canned tomatoes. Add mixture to the skillet and bring to a boil.
Return pork and veggies to the skillet and cook, stirring gently, for 1 minute. Serve topped with grated Parmesan cheese and enjoy!!