Sift sugar, flour and salt into medium mixing bowl. Stir in cookie crumbs. Combine butter and egg whites in separate bowl; add all at once to dry mixture. Mix just until combined.
Portion 1/4 cup batter onto hot waffle cone maker. Close lid and cook until golden brown on both sides. Remove and immediately roll into cone shape. Hold with a towel until shape sets. Remove towel and let cone cool completely on wire rack. Repeat with remaining batter.