This apple cinnamon mug cake is a quick and easy dessert that is perfect for those who want a single-serving treat. Made with simple ingredients like flour, sugar, eggs, and apples, this cake is moist, fluffy, and bursting with cinnamon flavor. The recipe takes only 5 minutes to prepare and 2 minutes to cook in the microwave, making it a great option for a late-night snack or a quick dessert. Serve it warm with a dollop of whipped cream or a sprinkle of cinnamon for a delicious and satisfying treat.