Start by heating your large pot over medium-high heat and spraying it with a little oil before adding the mushrooms and onions. Let them cook down for about five minutes until the onions are translucent and the mushrooms have released their moisture and started to brown. This initial step builds the savory foundation of the dish, so don't rush the browning process here.
Add the ground turkey, minced garlic, flour, paprika, thyme, salt, and pepper directly into the pot with the softened vegetables. Break the meat apart with your spoon and cook for roughly five minutes until the turkey is fully browned and no pink remains. The flour needs this time to cook off its raw taste and coat the meat, which helps thicken the sauce later.
Pour in the Worcestershire sauce and chicken stock, scraping the bottom of the pan to release any stuck-on flavor bits, then toss in the egg noodles. Gently stir everything together to ensure the noodles are evenly distributed and mostly submerged in the liquid so they cook uniformly. You want to make sure the pasta isn't clumped together before you cover the pot to begin the simmering process.
Increase the heat to bring the liquid to a boil, then immediately cover the pot and reduce the heat to a low simmer. Let it cook undisturbed for about 10 to 15 minutes, checking occasionally to ensure the noodles are becoming tender but not falling apart. The starch from the pasta will release into the stock during this time, naturally creating a silky, thickened sauce base.
Remove the pot from the heat completely before you attempt to stir in the light cream cheese and the Greek yogurt. Stir gently and continuously until the cream cheese has fully melted and the sauce looks uniform, glossy, and creamy. Adding the dairy off the heat prevents the yogurt from curdling or separating, ensuring a smooth and appetizing texture.
Let the pot sit off the heat, partially covered, for about 5 to 10 minutes to allow the sauce to set and thicken further. The noodles will absorb the remaining excess liquid during this rest period, resulting in a perfectly coated pasta dish rather than a soup. Finally, taste the stroganoff and add a pinch more salt or black pepper if you feel the flavors need a boost.