My mother clipped this from a magazine in 1965 and never stopped making it. Still the first thing requested at family reunions.

the oven cold from the refrigerator.

Crunchier topping: If you want a crisper top, place the casserole under the broiler for 1 to 2 minutes at the end, watching closely so the crumbs do not burn.

Serving tip: Let the casserole rest briefly before spooning it onto plates. That short rest helps the topping stay in place and makes each serving look neater on the table.