Alfredo Sauce

In a large saucepan, heat the butter over medium heat. Add the shallots; cook and stir until tender, two to three minutes. Add the garlic and cook for one minute longer.

Add the heavy whipping cream; cook and stir until the sauce is heated through. Stir in the Asiago cheese, Romano cheese, 1/2 cup Parmesan cheese, and the salt and pepper. Bring to a boil while stirring constantly. Reduce the heat and simmer, uncovered, until thickened, about 10 minutes. Whisk occasionally to prevent the sauce from burning.

Meanwhile, heat a pot of water and cook the pasta according to the package directions. Drain the pasta, reserving 1 cup pasta water.

Place the pasta in a serving bowl and add the sauce. Toss to coat. Thin out the sauce as desired with the reserved pasta water. Serve sauce sprinkled with the remaining 1/2 cup Parmesan cheese. If desired, top with parsley.