These brownies make a terrific dessert for a meat or dairy meal. Pareve, or neutral foods, such as eggs, are allowed, and margarine, if labeled pareve, is permitted.
Prepare and cool brownies but do not sprinkle with powdered sugar. Place on cookie sheet and freeze 30 minutes or until firm. Wrap in foil and place in an airtight freezer container or plastic freezer bag; seal, label, and freeze up to 2 weeks. Thaw overnight. Garnish as above.