Thinly slice the mushrooms.
Heat the oil in a non-stick frying pan. Add the steaks to the pan, season with salt, and fry for around 1-3 mins on each side (depending on your liking and the thickness of the meat).
Remove the steaks and keep warm under cover.
Add the mushrooms to the pan and fry for about 5 minutes. Add the crème fraîche and stilton and stir gently for 1 minute until it reduces to a thick, creamy sauce.
Serve the venison steaks with the sauce poured over it. Season with freshly ground black pepper.