Squash Casserole
["2 lb. squash (yellow, zucchini or white)", "1 medium onion, sliced", "3 Tbsp. butter", "3 eggs, separated", "1 (10 3/4 oz.) can cream of mushroom soup", "3/4 tsp. salt", "1/2 tsp. pepper", "Ritz cracker crumbs", "Parmesan cheese"]
["Cook squash and onion in boiling water until tender.", "Drain, mash and drain again.", "Add butter, beaten egg yolks, cream of mushroom soup, salt and pepper.", "Beat egg whites until stiff. Fold into squash mixture.", "Place mixture in a buttered 2-quart casserole dish.", "Top with Ritz cracker crumbs.", "Sprinkle with Parmesan cheese.", "Bake in a 350\u00b0 oven for 30 minutes.", "Makes 6 servings."]
["zucchini", "onion", "butter", "eggs", "cream of mushroom soup", "salt", "pepper", "cracker crumbs", "Parmesan cheese"]