Position the oven rack in the middle. Lightly grease a 9 x 13-inch baking dish or cast-iron skillet with oil.
Cook the pasta:
In a large pot, bring water to boil and cook pasta according to package directions. Once cooked, remove from heat, drain water, and return pasta to the pot.
Combine:
To the pasta, add the Alfredo sauce, chicken, ham, crumbled bacon, and Creole seasoning, and stir to combine. Reduce heat to low and heat ingredients through for 3 minutes, stirring frequently.
Transfer the hot pasta mixture to the greased baking dish and top with the cheeses.
Broil:
Broil on low for about 3 minutes, until the cheese has melted and a golden crust has formed. Carefully remove the dish from the oven and serve immediately.