Chicken Tetrazinni (What to Do with Leftover Spaghetti Noodles!)

2 c broken uncooked spaghetti (If it's cooked like ours was, just skip the 1st step)
3/4 c chicken broth
1 can (10 3/4 oz) cream of mushroom soup, undiluted
3/4 cup frozen peas, thawed
1/2 onion, chopped
1/8 t celery salt
1/8 t pepper
1 1/2 c chicken, cooked & cubed
1 1/2 c cheddar cheese, shredded and divided

1.  Cook spaghetti.
2.  Combine broth, seasonings and cooked spaghetti.
3.  Stir in chicken, peas, onion, and 1/2 cup cheese.
4.  Transfer to greased 8" square baking dish -- top with remaining cheese.
5.  Bake, uncovered 35-40 minutes or until heated through at 350 degrees F.

Note: We may also add green pepper on another occasion.