Stir in melted butter, cream cheese, and heavy cream, cooking until smooth. Add Parmesan cheese, salt, and pepper, and simmer for 5 minutes until thickened.
Combine the cooked fettuccine with the shrimp mixture, tossing to coat. If desired, add fresh mozzarella on top.
Transfer to a baking dish and broil for 2-3 minutes until the cheese is melted and golden.
Serve hot, garnished with additional Parmesan and parsley if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or on the stovetop.