We are living through an era of doughnut innovation like no other. Future historians will debate when this epoch began—did it all start with the cronut?—but even the most casual doughnut guzzler knows this is a golden era for glazed goods. We are spoiled with variations on a creme that our ancestors did not dare to dream of. Cookies on doughnuts! Cookies inside doughnuts! Pork floss doughnuts! Doughnuts rolled in cheese! Sourdough doughnuts! Gluten free! Vegan! Yellow! Red! Rainbow! Healthy doughnuts!