Using a whisk, mix together all the dry ingredients. In a separate bowl, beat your egg and add the milk. Cut an apple into small dice. Add the liquid to the dry mixture and mix until incorporated, using a spatula. Gently stir in the diced apples.
Pour the oil into your skillet and heat over medium high heat until it reaches 350 degrees F. If you don’t have a thermometer, test the oil by dropping a very small amount of batter into the oil. If it sizzles as soon as you drop some of the batter into the oil, you’re ready to start frying the fritters.
Turn the heat down to medium low and drop in spoonfuls of batter into the hot oil. I used about one tablespoon of batter per fritter. Fry only 4-5 pieces at a time. The fritters fry pretty quickly, about 2 minutes each side, depending on how hot your oil is. Make sure to keep an eye on them.
While your first batch of fritters is cooking in the oil, combine your sugar with the cinnamon and stir until well combined.
As soon as your fritters are done, place them on a paper towel lined plate to let some of the oil drip off. Shortly after, roll each fritter in the cinnamon sugar mixture and coat well. Place on a wire rack to cool completely.