Add white wine and stir well; cook until the mushroom juice and the alcohol have evaporated.
In the meantime, place the bread slices into a toaster on a low to medium setting.
Stir the cream into the mushrooms and mix well.
Season generously with salt and pepper to taste.
Mix cream cheese with garlic powder and spread onto each toast; pour the hot creamy mushrooms over; garnish with chopped parsley and serve immediately!