1. Steam or boil potatoes until just tender.
2. Place the potatoes in a greased pan.
3. Sauté the onion in butter.
4. Add the cheese and stir until cheese is melted.
5. Add the heavy cream, salt, and pepper.
6. Pour the sauce over the potatoes and bake at 350°F oven for 20 to 30 minutes until heated through.