In a bowl, whisk together flour, sugar, baking powder, cinnamon, and salt.
In another bowl, mix milk, egg, and vanilla, then combine with dry ingredients.
Fold in diced apples until well coated.
Heat oil in a deep pan to 350°F (175°C).
Drop spoonfuls of batter into hot oil and fry until golden brown.
Remove and drain on paper towels.
Dust with powdered sugar before serving.