I’ve spent most of my adult life being wary of roasted potato recipes. Instead, what matters is the type of potato and the addition of one special ingredient: Egg whites. “The egg whites help to create an herby, salt-and-pepper coating on the potatoes,” Kluger explained to me on the phone. All you need to do is whip two egg whites, using a whisk, in a bowl until they’re foamy (and there’s no liquid remaining in the bowl). Then put the coated potatoes in a strainer and discard the excess egg whites.