I didn't have the cheddar cheese so I used Swiss. LOL And fried the onion in the butter instead of cooking w/ the onion. Also added the Swiss to the white sauce. Will try it with the Cheddar next time. :)
1 1/2 lbs. zucchini thinly sliced 1 c. onion ditto
1 Tbs. butter 2 Tbs. flour 1 tsp. salt 1 c milk
dash cayenne 1/2 c shredded cheddar
1/2 c buttered crumbs
Cook zucchini & onion in small amount of water 5 minute. Drain well. Melt butter in pan, blend in flour, salt, cayenne. Add milk and thicken. Mix sauce & zucchini & place in baking dish. Top w/ cheese and crumbs. Bake @ 350º for 25 min.