Cut turkey schnitzel into strips, season with salt and pepper. Grease a baking dish and place the turkey strips in it. Set aside the herb butter of the butter vegetables. Put the vegetables and mushrooms in the pan. Mix the soup powder, cream and sour cream, pour over the vegetables. Chop up the herb butter and spread it on top of the casserole.
Bake in a hot oven for approx. 40 minutes at 200 ° C top / bottom heat.