Put the mushrooms in a small bowl or jar. Cover with the stout beer. Leave at room temperature for at least 30 minutes and up to 2 hours or until the mushrooms are soft and have reconstituted.
Drain the mushrooms and rinse well to remove any residual grit.
Slice the mushrooms into thin slices (unless mushrooms were pre sliced).
In a pan over medium high heat melt the butter with the olive oil.
Add the shallots and cook until softened and starting to brown, about 5 minutes.
Add the mushrooms to the pan, sprinkle with salt and pepper, cook until most of the oil and butter has been absorbed, about 5 minutes.
Preheat the boiler on the oven.
Slice the baguette into 18-24 slices.
Place the slices on a baking sheet. Place until the broiler until golden brown, about 2 minutes, flip over and place under the broiler until golden brown the opposite side.
In a small bowl stir together the goat cheese, thyme, sage and rosemary.
Spread each slice with goat cheese, top with mushrooms.
Serve immediately.