Look for chocolate cookie crumbs near the graham cracker crumbs in the baking aisle of the supermarket.
Twenty crushed chocolate wafer cookies can be used in place of the chocolate cookie crumbs. To crush the wafers, place them in a plastic bag or between two pieces of waxed paper and roll with rolling pin. Measure 1/2 cup of the crushed wafers to use in the recipe.
Egg whites can be beaten to their highest volume when they are at room temperature. To bring to room temperature, place a small bowl of egg whites in a larger bowl of very warm water. Stir them gently for a few minutes.