Heat olive oil over medium high heat in a 12" cast iron (or oven-proof) skillet. Add sausage and brown.
Stir in the onion flakes, garlic powder, chicken broth, Rotel, cream, pasta, and Creole seasoning.
Bring to a boil and reduce to a simmer. Cover and cook until the pasta is tender.
Stir in half of the cheese.
Sprinkle the remaining cheese over the top and place under the broiler until melted.
Serve garnished with the green onions.