Based on the ingredients, donuts are majorly classified as cake donuts and yeast donuts. The cake donut recipe uses baking powder and baking soda and its batter must be chilled before baking the donuts in the donut maker. Contrary to this, yeast is the main ingredient in the yeast donuts and its batter must be kept aside in a warm place so that it fluffs up and grows up to at least twice its original size before baking.