Start heating water for your pasta, so it’ll be at a boil once you’re ready for it.
Heat oil over medium heat in a large saucepan. Add the onion and mushrooms and cook for about 5 minutes, or until soft. Next, add turkey, breaking it up in the pan, and cook until brown. Add the next 6 ingredients (flour and spices) and stir to thoroughly combine. Stir in the broth, milk and mustard. Increase heat if needed to bring mixture to a boil, then reduce heat to a simmer and cook, uncovered, for 10 minutes or until sauce thickens.
Meanwhile, cook the noodles according to the instructions on the package. Drain water and return noodles to the pan. Stir in butter or margarine so the noodles won’t stick.
Mix in the greek yogurt into the sauce and heat through. Add salt and pepper to taste, then combine with the warm noodles. Serve immediately. Also keeps well in the fridge for a few days.
If you want to make this dish gluten free, you should be able to substitute cornstarch or arrowroot starch for the flour. And obviously pick up some gluten-free pasta as well.