Prepare spaghetti according to package directions in a large Dutch oven. Drain well, and return spaghetti to pot. Stir in turkey and next 8 ingredients; cook 7 minutes or until heated through. Remove from heat, and stir in 1 cup cheese. Pour into a lightly greased 8-inch square baking dish. Sprinkle evenly with remaining 1/2 cup cheese.
Bake at 350° for 15 minutes or until cheese melts.
*1 jarred roasted red bell pepper, diced, can be substituted.