Clean, wash and dry mushrooms. Clean, wash and cut spring onions into pieces. Peel garlic and chop finely. Stir crème fraîche, yoghurt and a quarter of the garlic until smooth.
Wash the thyme, dab dry and chop coarsely. Stir half the thyme into the dip. Season to taste with salt and pepper. Heat the oil in a large pan. Sauté the mushrooms in it in portions while turning.
Add spring onions and a quarter of the garlic and sauté briefly. Season with salt and pepper. Mix the fat and remaining garlic. Season with salt and pepper. Cut baguette in half lengthwise and spread with garlic cream.
Cut the baguette into pieces and bake under the grill of the oven for about 5 minutes until golden brown. Pour some yoghurt dip over the mushrooms and sprinkle with the remaining thyme. Add the dip and the garlic baguette.