Cook linguine according to pkg. Then toss it with 1 Tbsp of the butter.
Spray a 7 x 11 baking dish with non-stick cooking spray and add cooked pasta to the dish.
In a skillet, melt the remaining 2 Tbsp of butter and add mushrooms and onion. Season with some salt and pepper to taste and cook until tender and onions are translucent.
Add in the can of mushroom soup along with the milk, poultry seasoning, and cheddar cheese. Cook until well combine and cheese is melted.
Place turkey on top of pasta in dish and then pour the sauce over pasta and turkey.
Sprinkle with remaining cheese and bake uncovered at 350 for 30 minutes. Top with green onion if desired and serve. Serves 6.