Chicken Tetrazzini
["2 to 2 1/2 c. cooked spaghetti, broken in thirds", "1 1/2 to 2 c. cooked chicken, cut up into pieces", "1/2 small onion, diced", "1 can cream of chicken soup", "1/2 c. chicken broth", "1/2 tsp. salt and pepper", "1 3/4 c. grated Cheddar cheese", "1 (10 oz.) pkg. frozen peas"]
["Cook spaghetti and drain.", "Combine all ingredients except 1/2 cup of cheese.", "Put in a 9 x 13-inch baking pan.", "Sprinkle remaining cheese on top.", "Place in refrigerator for 1 hour.", "Bake at 350\u00b0 for 45 minutes.", "Can microwave in a 2-quart covered dish for 13 minutes on High.", "As a shortcut, can use precooked chicken breasts."]
["chicken", "onion", "cream of chicken soup", "chicken broth", "salt", "Cheddar cheese", "frozen peas"]