Whisk cinnamon and sugar together in a small bowl for the cinnamon sugar topping.

Pour buttermilk into a blender and crack in the eggs.

Pulse the blender once or twice to combine.

Add flour, baking powder, cinnamon, sugar, and salt to the blender.

Blend until a smooth batter forms, scraping the sides as needed.

Rest the batter for 15 minutes.

Transfer the batter to a large bowl.

Add diced apples and mix well.

Pour a one-inch deep layer of oil into a large skillet or pot.

Heat the oil over medium-high heat until it reaches 375°F.

Carefully drop a heaping tablespoon of batter into the hot oil.

Repeat, turning and frying the fritters until golden brown and delicious (2-3 minutes).

Maintain the oil temperature between 365°F and 375°F.

Toss the fritters in the cinnamon sugar as they come out of the oil.

Serve hot, as is, or with cinnamon applesauce.