Step 1

Place first 3 ingredients and water to cover in a large Dutch oven. Bring to a boil over high heat. Cover and reduce heat to medium-low. Simmer 1 hour or until tender. Remove chicken, reserving broth in Dutch oven. Cool chicken completely (about 20 minutes). Discard bay leaf. Skin and bone chicken, and cut meat into pieces.

Step 2

Preheat oven to 350°. Remove and reserve 1/4 cup chicken broth. Bring remaining broth in Dutch oven to a boil over high heat. Break spaghetti into thirds, and cook in broth 12 to 15 minutes or until tender; drain well, discarding broth. Return spaghetti to Dutch oven.

Step 3

Melt butter in a large skillet over medium-high heat. Add onion and next 3 ingredients, and sauté 5 minutes or until tender; add to spaghetti. Stir together soup and 1/4 cup reserved broth; stir into spaghetti mixture. Stir in chicken, tomatoes, and next 3 ingredients. Add salt to taste. Spoon mixture into a lightly greased (with cooking spray) 13- x 9-inch baking dish. Top with cheese.

Step 4

Bake at 350° for 15 to 20 minutes or until cheese melts.