Bring a large pot of lightly salted water to a boil. Add pasta andcook for 8 to 10 minutes or until al dente; drain.Heat the oil in a skillet over medium heat, and saute the garlic untillightly browned. Mix in the tomatoes, onion, yellow bell pepper, redbell pepper, zucchini, and mushrooms. Cook and stir until tender.Mix the balsamic vinegar into the skillet. Toss with the cookedspaghetti, and sprinkle with feta cheese to serve.