In the same skillet add the remaining butter, cooking the garlic until soft and fragrant.
Add the flour to the skillet and whisk until smooth, removing all lumps from the flour, approximately 2 minutes. Next, add the heavy cream to the skillet while constantly whisking to prevent lumps from forming, another 3 minutes. Keep the heat low to prevent the sauce from sticking to the pan. Add the grated Parmesan cheese, nutmeg, oregano, Old Bay seasoning, salt, and pepper to taste, whisk until combined. Continue whisking until the sauce has thickened, 5 to 8 minutes. Add the pasta and seafood back to the skillet. Toss several times, if the sauce thickens too much thin it with a little pasta water or milk.
Recipe by The Crafty Boomer at https://www.thecraftyboomer.com/creamy-shrimp-and-scallop-fettuccine-alfredo/