Add the white wine, heavy cream, thyme, pepper, chicken bouillon, and mushrooms and bring to a simmer. Cover and simmer for another 15 minutes, stirring occasionally. Remove the cover and simmer for another 5 minutes, or until the sauce is slightly thickened.
While the sauce is cooking, rub both sides of the steak with salt and pepper. Grill the steaks for about 3 minutes on each side or until desired doneness has been reached.
Pour some sauce over each piece of steak and serve immediately.
Recipe by The Little Chef at http://littlechefblog.com/steak-creamy-mushroom-sauce/