Bring a large pot of salted water to a rolling boil.
Add the rotini pasta to the boiling water and cook according to package directions, or until al dente.
Drain the pasta in a colander and rinse with cold water to stop the cooking process.
Add Pasta to a large, deep-walled casserole dish.
Preheat oven to 350°F (175°C).
Combine shredded rotisserie chicken, Marie's Blue Cheese Dressing, sour cream, Frank's Red Hot Sauce, and two tablespoons of green onion.
Top casserole with shredded extra sharp white cheddar cheese.
Bake in a preheated oven at 350°F (175°C) for 20-25 minutes, or until the cheese is melted and bubbly
Top casserole with remaining sliced green onions.
Let the casserole cool for a few minutes before serving.