In a large bowl, whisk together the flour, granulated sugar, baking powder, salt, and cinnamon.

In a separate bowl, whisk together the milk, egg, and vanilla extract.

Gradually add the wet ingredients to the dry ingredients, mixing until just combined and a thick batter forms.

Gently fold in the diced apples.

Heat vegetable oil in a large heavy-bottomed pot or Dutch oven over medium-high heat until it reaches 350°F (175°C).

Carefully drop spoonfuls of the batter into the hot oil, frying a few at a time without overcrowding the pot.

Fry for 2-3 minutes per side, or until golden brown and cooked through.

Remove the fritter bites with a slotted spoon and place them on a wire rack lined with paper towels to drain excess oil.

In a small bowl, whisk together the powdered sugar, milk, and vanilla extract until smooth.

Dip each warm apple fritter bite into the glaze, or drizzle the glaze over them, ensuring they are fully coated.