Combine the breadcrumbs, grated cheese, cream, egg yolks, nutmeg, salt and pepper.
Break the cauliflower into flowerets. Cover with boiling salted water. Cook until tender. Drain. Put the cauliflower into a heavily buttered shallow baking dish.
Spoon the cheese mixture over the cauliflower. Dribble the melted butter over the cheese mixture.
Bake in a 350 degree oven for 15 to 20 minutes, or until the cheese is crusty and brown.