Preheat oven to 350 degrees. Use the butter to butter an individual baking dish or large custard cup. Place 2 tbsp. of sauce in it and then mozzarella cheese. Carefully break the egg into the dish. Season with salt and pepper. Top with remaining 2 tbsp. sauce and sprinkle with Parmesan. Bake for about 12-14 minutes, until eggs are set. The white will be cooked, and the yolk will be liquid- like a soft-boiled egg. Makes 1 serving.