broccoli in parmesan cheese sauce

 I made this for Thanksgiving

2 pounds of broccoli (steam it in the microwave until just tender - set aside)
1 small onion (minced) I don't use the onion - onion and I don't get along
6 tblsp butter -- 4 tblsp flour -- 2 Cups milk -- 1/2 tsp salt - pepper to taste  -- 1 Cup parmesan cheese -- 1/2 C bread crumbs.

cook the onion in 4 tbsp of the butter until tender - stir in the flour  -- add the milk gradually  and cook until thickened stirring constantly.  Add the salt, pepper and parmesan -- stir until cheese melts.  Pour 1/2 of the sauce into a  greased  or cooking sprayed baking dish.  arrange the broccoli - pour the rest of the sauce over the top, dot with the remaining butter and sprinkle with bread crumbs.
Bake in a 400 degree oven for about 20 min