Bring a large pot of salted water to a boil. Cook pasta until al dente. Reserve 1 cup pasta water, then drain.
In a large skillet over medium heat, add olive oil. Add sausage and sear for 2-3 minutes per side, until browned. Remove and set aside.
In the same skillet, sprinkle in flour. Whisk, scraping up browned bits, until a paste forms and begins to brown.
Slowly whisk in chicken broth, Cajun seasoning, garlic powder, and salt. Bring to a light simmer, whisky continuously until slight thickened. Add heavy cream and stir to combine.
Add corn and Parmesan. Simmer for 5 minutes, stirring.
Return pasta and sausage to the skillet. Toss to combine.
Add reserved pasta water as needed, 1 tablespoon at a time, to reach desired consistency.
Garnish with parsley and extra Parmesan. Serve warm.