Whisk together the flour, sugar, baking powder, cinnamon, and salt in a large bowl.
Add the milk, eggs, oil, and vanilla to the flour mixture. Stir until well combined. Stir in the apples until well combined.
Working in batches, drop the batter by tablespoonfuls into the hot oil and fry until golden brown on both sides, about 4-5 minutes, depending on the size of your fritters.
Remove the fritters from the hot oil using a slotted spoon or wire skimmer and drain briefly on paper towels to absorb some of the oil.
While the fritters are still warm, gently toss the fritters in the cinnamon sugar.
Notes
Don’t overcrowd the fryer. It is important to work in batches.
If you prefer glazed fritters, you can combine 2 cups of powdered sugar with approximately 6 tablespoons of milk. Use this mixture to glaze your fritters.
For even more apple flavor, switch out the milk for apple cider or apple juice.
No cinnamon sugar on hand? Make your own by combining 1 cup of granulated sugar with 1/4 cup of ground cinnamon.