Sprinkle the ham evenly over the cauliflower.
05Whisk together the egg yolks, sour cream, heavy cream, nutmeg, salt and pepper and pour evenly over ham and cauliflower.06For the topping:.07Toss the crumbs and parmesan well to combine, then scatter evenly over the cauliflower mixture. Dot well with butter.08Bake uncovered 25-30 minutes, until bubbling and lightly browned.09Serve at once.