1 lg. head cauliflower (about 6 c.)
1/4 c. butter (divided)
1/2 c. diced onion
1 1/2 c. (6 oz.) shredded cheese
1 c. (8 oz.) sour cream
1/4 tsp. salt
1/2 c. dried bread crumbs

Break cauliflower into sections. Cook for 10 minutes in boiling salted water. Drain well. Combine cauliflower with 2 tablespoons butter and onion, cheese, sour cream, and salt. Spoon into 1 1/2 quart casserole. Melt remaining butter and toss with bread crumbs. Sprinkle over the cauliflower mixture. Bake at 350 degrees for 30 minutes.