Boil pasta in salted water. Reserve ½ cup pasta water, then drain.
Brown the sliced sausage in a skillet.
Add minced garlic and cook about 30 seconds.
Add Cajun seasoning, garlic powder, onion powder, smoked paprika, and salt. Stir for about 30 seconds.
Pour in ⅔ cup heavy cream and a splash of pasta water. Simmer for 1–2 minutes.
Add the mozzarella and stir until creamy.
Add the baby spinach and let it wilt down.
Toss in the pasta. Add more pasta water or cream as needed until the sauce is silky.
