Remove mushroom stems;clean caps and set aside. Discard stems. In a mixing bowl, combine all ingredients except mushrooms, parsley and lemon wedges. Beat well. Fill each mushroom cap with enough of the mixture to form a dome. Place on a lightly greased baking sheet. Bake at 425 for 10-15 minutes. To serve, place mushrroms on a platter and garnish with parsley and lemon wedges.