Broccoli-Nut Casserole

3/4 c. chopped, roasted peanuts
1 can cream of mushroom soup
2 (10 oz.) pkg. chopped broccoli
1 c. mayonnaise
2 eggs, well beaten
1 c. grated sharp Cheddar cheese
1/4 c. margarine
2 c. dry bread crumbs
1 medium onion, chopped or 1 1/2 tsp. onion flakes
Cook broccoli according to package directions. Drain. Add soup, mayonnaise and peanuts. Mix well. Add eggs and onion; mix well. Melt margarine and pour over bread crumbs. Put broccoli mixture into greased 1 1/2 or 2 quart casserole. Sprinkle with grated cheese and top with crumbs. Bake at 350 degrees for 30 minutes.