5 lbs. peeled and sliced potatoes
1/2 lg. onion, diced
3 tbsp. butter
8 oz. grated Cheddar cheese
8 oz. mushrooms, sliced
Salt and pepper

Alternate layers of ingredients on a large sheet of aluminum foil, salt and peppering to taste. Wrap tightly. Bake at 350 degrees for 45 minutes or place on grill for 30-45 minutes and serve.