Cook noodles following package directions. Drain.
Heat oven to 375 degrees F. Coat shallow 12 x 7 x 2-inch or other 2-1/2- to 3-quart baking dish with cooking spray.
Sauté onion in butter in medium-size saucepan over medium heat until softened, about 3 minutes. Stir in the garlic, oregano, basil and nutmeg; sauté for 1 minute. Remove saucepan from heat. Stir in the ricotta until well blended. Stir in chicken broth, salt and pepper. Stir in the turkey.
In a large bowl, combine cooked noodles, spinach, turkey mixture and all but 2 tablespoons of the Parmesan cheese. Scrape into prepared casserole. Cover with aluminum foil.
Bake in 375 degree F oven for 15 minutes. Sprinkle top with the remaining 2 tablespoons of the Parmesan cheese. Bake, uncovered, for 20 minutes. Makes 6 servings.