A malt shake, also known as a malted milkshake, is a type of milkshake that includes the addition of malted milk powder. Malted milk powder is a mixture of malted barley, wheat flour, and evaporated whole milk powder that adds a nutty, toasted flavor to the shake. It was initially developed as a nutritional supplement for infants. Malt shakes are thicker and toastier than regular milkshakes. They are a classic American diner and soda fountain drink that has been popular since the 1920s. Malt powder is different from malted milk powder, which is used to make malt shakes. Malt powder is often used in breadmaking to feed the yeast in the mixture, causing the dough to rise quickly and the resulting bread to spring well. Malt shakes can be made with any flavor of ice cream, but chocolate is the classic flavor.