Chop the onion finely and fry in the pan until it starts getting golden brown. Then add chicken cut into thin noodles,salt and pepper. Careful when using a salt, blue cheese added later is salty enough itself.
In a pan crumble a blue cheese and let melt. Then add processed cheese. When also melted start pouring in the cream. The amount depend on how thick you want the gravy. When thick as desired add chicken noodles with fried onion and stir well.
Gravy goes great with mushrooms also.
Ready gravy with chicken serve with pasta the best.