In a skillet and over medium heat, heat about 2 tablespoons of the butter until completely melted.
Once the foaming subsides, add the mushrooms and fry, over high heat for about 2 to 3 minutes until the mushrooms have absorbed all of the melted butter and become tender.
Add 1 tablespoon of white vinegar or white wine if you want, then keep stirring and frying for about 3 min.
Bring another saucepan and melt about 3 tablespoons of butter.
Once the butter is completely melted, stir in the flour and cook for 2 minutes.
Add the chicken broth or turkey broth if you have one and bring it to a boil.
Cook, over low heat, for about 5 to 10 minutes or until becoming a little bit thick.
Add the heavy cream and cook for a minute until all is well combined.
Season to taste with salt and pepper then fold in the mushrooms and turkey.
Preheat the oven to 350°F.
Grease the casserole with melted butter or oil.
Layer half of the cooked pasta, and half of the mushroom and turkey mixture and repeat with the pasta and turkey mushroom mix.
Top the mixture with Parmesan and bread crumbs.
Bake for 45 minutes or until heated through, the sauce is bubbling and the top is golden brown.
If you want, you can slide the casserole under the broiler for 2 or 3 min to brown the top.