Cut the fillet into thick slices, flatten them with your hand, season with salt and pepper and fry well in a little oil.
Then place in a wide baking dish.
In the roasting set, sauté the leafy, seasoned mushrooms and then layer them on the fillet. Thinly slice the brie and place on top of the mushrooms.
Peel off the roasting set with cream and wine, bring to the boil and thicken the sauce a little with flour, season with spices with spices (everyone as he likes it) and distribute the sauce on the ingredients in the baking dish. Let it steep overnight (but you can also prepare it in the morning for a delicious dinner).