1: Rehydrate 100 g dried morels, and set aside the mushrooms "jus" (juice) you got.
2: Melt 1 onion and 30 g butter in a large pan over medium heat. Chop 1 onion and cook in this oil-butter mix for 1 minute, then salt and pepper.
3: Add the drained mushrooms, 1 glass dry white wine and 2 or 3 ladles of mushroom water. Cook the mushrooms in this mixture until all the liquid has evaporated.
4: Pour 400 ml liquid cream over the mushrooms, salt and pepper once more, then leave uncovered over low heat to thicken.
5: Cut the bread into thick slices and butter.
6: Fry the bread until golden over high heat, starting with the buttered side. Heat the serving plates.
7: Place a slice of fried bread on each plate. Tip: cut a hole in the middle of each slice with a cutter. You can then fill it with mushrooms more easily.
8: Divide the mushrooms in their cream sauce between the plates and serve immediately.
Remarks
As you can see from the photos, I used a mixture of wild mushrooms here, but morels are by far the best for this.