12 ounces uncooked spaghetti, broken in half
1 can (10¾ ounces) condensed cream of mushroom soup, undiluted
1 can (10¾ ounces condensed cream of chicken soup, undiluted
1 cup (8 ounces) sour cream
½ cup milk
¼ cup butter, melted, divided
2 tablespoons dried parsley flakes
½ teaspoon garlic powder
½ teaspoon salt
¼ teaspoon pepper
2 cups (8 ounces) shredded part-skim mozzarella cheese
1 cup grated Parmesan cheese
2 to 3 celery ribs, chopped
1 medium onion, chopped
1 can (4 ounces) mushroom stems and pieces, drained
5 cups cubed cooked chicken
1½ cups crushed cornflakes