1/2 cup butter
1/2 cup sliced green onions
1/2 cup grated Parmesan cheese
1/2 cup shredded mozzarella cheese
Preheat oven to 350 degrees F (175 degrees C).
Preheat oven to 350 degrees F (175 degrees C).
Place butter and green onions in a shallow baking dish. Place cheese cubes in same dish and sprinkle with mozzarella cheese.
Bake 8-12 hours, or until cheese is bubbly and cheese is melted. Remove cheese cubes, and top with remaining beef.