Step 1

Preheat oven to 350°F and grease a 9x13-inch baking dish with butter or nonstick spray. Set aside.

Step 2

Cook spaghetti to al dente according to package instructions. Drain and set aside.

Step 3

In a large pot over medium-high heat, melt butter until foaming subsides. Add mushrooms and season with salt and pepper and cook until liquid releases and evaporates, about 5 minutes.

Step 4

Add onion and cook until soft, about 4 minutes. Stir in garlic and cook 1 minute more.

Step 5

Stir in flour and cook 1 minute. Stir in broth and half and half, and let cook until thick and bubbly. Let boil 1 minute.

Step 6

Stir in cream cheese until melted. Season to taste with salt and pepper and stir in parsley and Italian seasoning.

Step 7

Stir in spaghetti, turkey, and 1 cup of the mozzarella.

Step 8

Transfer to baking dish, top with remaining mozzarella, cover with foil, and bake 20 minutes.

Step 9

Remove foil, top with Parmesan and breadcrumbs and bake until golden brown and bubbly, about 15 minutes more.