Turn a burner to medium-high heat and heat up the skillet for 2 minutes
Add the Earth Balance for the sauce recipe and stir it to melt, approx 30 seconds
Add the sliced mushrooms and stir them to coat in the melted "butter"
Allow the mushrooms to cook, sauteing occasionally, for 3 minutes
Add the wine and stir to combine
Allow the sauce to bubble and cook for 5 minutes, stirring if the sauce starts to rise in the pan
Start a second saucepan on another burner and CAREFULLY transfer the sauce from the cast iron to the new pan, scraping as much out as you can.
Once the sauce is in the second pan, add the yogurt and fresh Thyme; stir well to combine
Turn the heat for the sauce pan to low and allow to thicken while you cook the steak
In the cast iron, add another Tbs of "butter", scraping the remaining sauce off the bottom of the pan and mixing it with the melting "butter". The heat should return to medium high
Add the steaks and cook for 2 minutes on each side, flipping to the other side until the steaks are cooked to your desired (but safe) liking, approx 10 minutes
Serve steak over noodles with a green vegetable, and cover with sauce