This protein-packed cappuccino cake recipe is perfect for those who want to increase their protein intake. Made with oat flour, whey protein powder, and Greek yogurt, this cake is high in protein and low in fat. The cappuccino flavor comes from a combination of instant coffee and cocoa powder. The cake is moist and fluffy, with a subtle coffee flavor that is not too overpowering. This cake is perfect for a mid-day snack or as a dessert after dinner.