Sauté the onions, diced mushroom, garlic in butter and olive oil in skillet on 7 until mushroom are tender and onion is translucent (sauté with a pinch of salt and peppercorn)
While this is going, start water to boil with olive oil for pasta. Add pasta once it comes to a rolling boil
Season crawfish with creole seasoning, Italian herbs, onion powder
Add crawfish. Since the crawfish comes cooked you don't want to over cook it and it be rubbery ( 6 minutes ).
Add entire can of tomato and tomato juice. Season more if necessary. Bring to a slow simmer. (Preheat oven at this time to 365)
Add heavy cream to a cup, whisk flour until lumps are gone. Add mixture to pot depending on desired thickness. Add Parmesan cheese. Stir until all the ingredients are completely covered in the sauce. Let simmer for 5 minutes
Add pasta in skillet, stir until completely covered.
TOP w/ Parmesan. Bake in oven for 17 minutes.