1. Cook the spaghetti according to the package directions, omitting salt. Drain well.
2. While the pasta is cooking, heat the margarine in a large skillet and add the onion, saute until soften (2-3 minutes).
3. Stir in the vegetables and chicken broth. Cover and simmer until vegetables are tender (5-6 minutes).
4. Stir in parsley, basil, lemon juice, salt, and pepper and cook to combine the flavors (2-3 minutes).
5. Toss the spaghetti with the vegetable mix and sprinkle with Parmesan cheese to serve.