1 crusty French baguette, cut into 24 slices
1/2 cup olive oil
1/4 cup grated Gruyere cheese
1 tablespoon unsalted butter
5 cups button mushrooms (or a mushroom mix), sliced
1/2 cup white wine
1 tablespoon tamari
A pinch of sea salt
1/4 cup chopped chives
1/4 cup chopped fresh flat-leaf parsley