Southwestern Chicken Garden Casserole
10-oz. package frozen spinach, thawed 3 small yellow summer squash, thinly sliced 1 red bell pepper, cut into 1/2-inch pieces 1 yellow onion, thinly sliced 2 Tbs. peanut oil 3 cups cooked chicken, cubed or shredded 12 small corn tortillas, cut into pieces 10 3/4-oz. can cream of celery soup,…