Preheat oven to 350°.
Cook pasta according to package directions, omitting salt and fat. Drain.
Heat oil in a large nonstick skillet over medium-high heat. Add green bell pepper, mushrooms, and onion. Sauté 5 minutes or until tender.
Combine cooked pasta, green bell pepper mixture, turkey, and next 5 ingredients in a large bowl. Spoon mixture into an 11 x 7- inch baking dish coated with cooking spray.
Cover and bake at 350° for 15 minutes. Uncover and bake an additional 10 minutes.