Preheat oven to 180 °C. Heat butter in a pan. Add halved shallots and sauté till the shallots turn pink in colour. Add chopped garlic and sauté. Add mushrooms, corn niblets and spinach and sauté for a minute.
Add white sauce and mix well. Add fresh cream, nutmeg powder and crushed black peppercorns. Put the spinach mixture in an ovenproof dish and layer it with grated cheese. Gratinate in a preheated oven for five minutes.
Serve hot with French Bread Crispies.