Cook the pasta according to the package instructions until al dente.
In a large pot, combine the heavy cream, kosher salt, black pepper, ground mustard, smoked paprika, garlic powder, and onion powder. Stir well to combine.
Add the cream cheese and chopped pimentos to the pot. Stir until the cream cheese is melted and the mixture is smooth.
Gradually add the shredded cheddar cheese to the pot, stirring constantly until all the cheese is melted and the sauce is creamy.
Once the sauce is smooth and well-combined, add the cooked pasta to the pot. Stir until the pasta is evenly coated with the creamy cheese sauce.