
Heat oven to 375°F. Combine topping ingredients and set aside.
Cook pasta al dente according to package directions.
Cook onion, mushrooms, and garlic in butter until tender, about 5 minutes.
In a large bowl combine soup, mushroom mixture, milk, seasonings, and ½ of the cheese. Fold in turkey and pasta.
Spread into a 9x13 casserole dish, top with remaining cheese, and sprinkle with topping.
Bake 30-35 minutes or until hot and bubbly.