Bring a large pot of water to boil, with 2 teaspoons salt.
2 teaspoons Salt
Add the Fettucine Noodles and cook until Al Dente per the package instructions (about 8-9 Minutes). Drain and set aside. Reserve 1 cup of the pasta water in case you need it later.
½ Pound Fettuccine Noodles
In a large ovenproof skillet - a cast iron skillet if you have one - heat the olive oil over a medium to medium high heat. Add the shrimp for a few minutes either side, then remove to the side.
2 Tablespoons Olive Oil, 1 Pound Large Shrimp
Add the chopped onions, garlic and parsley and cook a few minutes until the onions are soft and the garlic is fragrant.
½ Each Yellow Onions, 4 Cloves Garlic, ¼ Cup Fresh Parsley
Add the butter, cream cheese, cream, red pepper flakes and salt and pepper. Continue stirring until all has melted.
½ Cup Unsalted Butter, 4 Ounces Cream Cheese, 1 Cup Heavy Whipping Cream, ¼ teaspoon Red Pepper Flakes, Kosher Salt and Black pepper to taste
Stir in the parmesan until melted.
½ Cup Parmesan Cheese
Add the noodles back, along with the shrimp and stir to combine.
Top with the grated mozzarella and place under a broiler for a few minutes until the cheese on top has melted and turned a golden brown.
1 Cup Mozzarella Cheese
Notes
Feel free to change up the amount of butter - I usually play it by ear mostly but add anywhere from 6-8 tablespoon butter.Sprinkle a few tablespoons parsley for garnish if you want to pretty it up.Have a few tablespoons parmesan handy to serve with, in case anyone wants extra to sprinkle on top.When reheating this dish you may need a splash of milk to thin it a little.For a little extra texture try sprinkling some bread crumbs on top with the mozzarella.