Turn the oven on at 190°C, air ventilation, rack in the middle.
60’ prior to cooking, remove the cut chicken fillets from the refrigerator. Add the fillets in an oven proof dish, pour the oil over them and season with ½ tsp of salt and ½ tsp of pepper. Cook in the oven for 35’.
Place a sauteing pan on medium/high heat and add the margarine along with the garlic.
Once the margarine has melted add the sliced mushrooms and sauté for 2-3’ for the mushrooms to soften.
Deglaze with the wine, reduce the heat, and allow for the alcohol to evaporate.
Add the cream along with the mustard and thyme, season with the remaining salt and pepper, mix well and simmer until the sauce has a nice consistency.
Remove the chicken fillets from the oven into a dish, add some rice to the side and add the sauce on top of the chicken. Green beans are a nice pair or any other vegetable available.