Cook the pasta in salted boiling water according to packaging. Drain in a colander, drizzle with a little olive oil to prevent sticking and set aside. Heat a skillet and sear the smoked sausage on both sides. Remove from the pan, slice and set aside. Season the shrimp with the Cajun seasoning. Toss to coat.
Add the garlic, cooking until fragrant. Lower the heat, and pour in the cream and milk. Add the grated parmesan cheese, and stir about 4-5 minutes. Give the sauce a taste, and add extra salt and pepper, if necessary.
Grate your own cheese or purchase the grated stuff from your grocery’s cheese counter. Please don’t use a shelf-stable cheese in this recipe. It will not taste the same.