Cook pasta according to package directions, omitting salt and fat.
While pasta cooks, heat oil in a large nonstick skillet over medium-high heat. Add chicken; cook 3 minutes or until lightly browned. Add onion and garlic; cook 2 minutes. Add bell pepper and mushrooms; cook 5 minutes or until tender. Stir in remaining ingredients; cook 6 minutes or until thoroughly heated. Serve over pasta.