A great accompaniment for chicken or turkey.
Slice the mushrooms, stems on, and place a layer on bottom of a 1-½-quart greased casserole. Mix together the butter or margarine, parsley, onion, mustard, salt, pep-per, nutmeg and flour. Dot the first layer of sliced mushrooms with half this mixture. Add a second layer of mushrooms and top with the rest of the butter mixture.
Pour the cream over all, then bake uncovered at 350 degrees F for 1 hour.