Bring a large pot of water to boil and add the seafood seasoning (crawfish, shrimp and crab boil seasoning).
Add the fettuccine noodles and cook for 8-9 minutes, until al dente. Drain and set aside.
Add the stick of butter to a large skillet and turn on the heat to med-high.
Add the chopped shallots and garlic and cook until translucent.
Add the Creole seasoning, the soup, tomatoes and chilies and Worcestershire sauce. Cook until bubbling.
Add the cubed Velveeta cheese and stir until totally melted and incorporated.
Add the crawfish tails and green onions and cook another 2 minutes then turn off the heat. Add the cooked pasta.
Cover with foil and place in the oven for 15 minutes.
Serve with Parmesan Cheese and garlic bread.
Notes
Reserve some of the pasta water for if you want to add a little moisture to the dish after it's cooked.If you like more heat to your food you could add a pinch of cayenne pepper.