Cook the ravioli: Bring a large pot of salted water to a boil. Cook the ravioli according to the package directions, usually 3–4 minutes. Reserve 1/2 cup of pasta water, then drain.
Sauté the aromatics: Melt the butter in a large skillet over medium heat. Add the garlic and shallot. Cook for 1–2 minutes until fragrant.
Make the sauce: Add the heavy cream and milk. Stir and bring to a gentle simmer.
Add Parmesan: Lower the heat and stir in the Parmesan until melted and creamy. Add Italian seasoning, salt, pepper, and optional nutmeg.
Add pasta water: Slowly add the reserved pasta water, a little at a time, until the sauce reaches your desired creamy consistency. You may not need the entire cup.
Add ravioli: Gently fold the cooked ravioli into the sauce until well coated.
Serve: Top with extra Parmesan and black pepper.