How To Make Chicken Spaghetti Casserole

2 cups chopped cooked chicken breast

2 cups uncooked spaghetti noodles, broken into 2-inch pieces (about 7 ounces)

1 cup (1/4-inch-thick) slices celery

1 cup chopped red bell pepper..

1 cup chopped onion

1 cup fat-free, less-sodium chicken broth

1/2 teaspoon salt

1/4 teaspoon freshly ground black pepper

2 (10.75-ounce) cans condensed 30% reduced-sodium 98% fat-free cream of mushroom soup

Cooking spray

1 cup (4 ounces) shredded cheddar cheese, divided