Saute onion in butter. Add partially thawed broccoli to onion and butter, simmer ... top of the casserole. Bake at 325 degrees, ... and topping is browned.
Heat soups and mayonnaise in ... mixture, chicken, and broccoli; repeat layers. End with ... butter over entire casserole. Bake at 350 degrees ... day ahead and refrigerate.
Combine soup, mayonnaise, egg, onion, salt and pepper and broccoli in medium mixing bowl. Pour mixture into greased casserole dish and sprinkle with grated ... degrees for 45 minutes.