Take the half butter and put it in big fry pan and melt it slowly increase your fire and add the onion the garlic and sauté them well. Add the mushrooms and sauté them well too. Add salt and pepper. Add your marsala wine and let reduce the juice ( but do not dry the mixture)
Melt in a small pot the other half butter.
Toast well all the brioche bread slices and brush them with the melt butter.
Add one slice toasted bread on the bottom of the plate add 2 soup mushrooms and spread them nice and add a nice slice of the mozzarella cheese. Repeat it one more time and on top add the basil leave.
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