Separate the egg yolk from the egg whites and put the egg whites into a large mixing bowl. Use an electric mixer to beat the egg whites until they form stiff peaks and set aside.
Use a separate mixing bowl to combine flour, baking powder, salt, granulated sugar, and milk. Beat with an electric mixer until all the ingredients are well combined. Slowly mix the soda into the batter.
Use a spatula to gently fold the stiff egg whites into the batter.
Fold the sliced apples into the batter.
Making Cinnamon Sugar
Combine cinnamon and ¼ cup of granulated sugar in a small bowl. Set aside.
Making the Pancakes
Heat ½ teaspoon of vegetable oil in a large skillet over medium-high heat. Pour about 1 cup of the pancake batter into the skillet.
Cook the pancake until bubbles form (about 3-4 minutes). Flip the pancake and cook for an additional 3-4 minutes. Add more vegetable oil for the next pancake and repeat the process until all pancakes have been cooked.
Serve on a plate and drizzle with the cinnamon-sugar mixture.
*Nutrition calculation does not include the cinnamon sugar since the amount will vary from person to person.