Cauliflower Au Gratin
["1 large head cauliflower (about 6 c.)", "1/4 c. margarine, divided", "1/2 c. diced onion", "1 1/2 c. shredded Cheddar cheese (6 oz.)", "1 c. sour cream (8 oz.)", "1/4 tsp. salt", "1/2 c. dried bread crumbs"]
["Break cauliflower into sections.", "Cook for 10 minutes in boiling water, which has been salted.", "Drain well.", "Combine cauliflower with 2 tablespoons margarine, onion, cheese, sour cream and salt.", "Spoon into a 1 1/2 quart casserole.", "Melt remaining margarine and toss with bread crumbs.", "Sprinkle over the cauliflower mixture.", "Bake at 350\u00b0 for 30 minutes or until heated through.", "Yield:", "10 to 12 servings."]
["head cauliflower", "margarine", "onion", "Cheddar cheese", "sour cream", "salt", "bread crumbs"]