Sodium stearoyl lactylate (SSL) forms strong bonds with the flour proteins during gluten development, improving dough strength. During protein denaturation at baking temperatures, these bonds weaken and SSL is able to translocate to the starch molecules, reducing their staling rates during storage 1.
Place the ice cube tray in the freezer and freeze the egg whites until firm. Pop the egg whites out and transfer them to a zip-top freezer bag and return to the freezer. Now, whenever you need one, two or three egg whites for an egg-white-only recipe, you have them, premeasured, at your disposal.
Follow package directions to substitute pasteurized dried or pasteurized refrigerated liquid egg whites for raw egg whites or use about 2 tablespoons water and 2 teaspoons dried egg white or 2 to 3 tablespoons liquid egg white for each large egg white.