Clean, clean and slice the mushrooms, or cut small mushrooms in half. Wash thyme, shake dry. Strip the leaves from the stalks, except for a little bit for garnishing. Peel and chop garlic
Heat oil and butter in a pan and fry the mushrooms for about 5 minutes. After about 3 minutes add garlic and thyme. Season to taste with salt and pepper
Toast the bread in portions. Add crème fraîche to the mushrooms and heat briefly. Arrange bread and mushrooms on plates, garnish with thyme