In a large mixing bowl, whisk together flour, granulated sugar, baking powder, salt, and cinnamon.
In another bowl, whisk together eggs, milk, and vanilla extract until well combined.
Add the wet ingredients to the dry ingredients and mix until just combined.
Fold in the diced apples.
Heat the Oil:
Heat vegetable oil in a deep fryer or large pot to 350°F (175°C).
Fry the Fritter Bites:
Using a tablespoon or small cookie scoop, carefully drop spoonfuls of batter into the hot oil.
Fry the fritter bites in batches until golden brown and cooked through, about 2-3 minutes per side.
Use a slotted spoon to transfer the fritter bites to a baking sheet lined with paper towels to drain.
Make the Glaze:
In a small bowl, whisk together powdered sugar, milk, and vanilla extract until smooth.
Glaze the Fritter Bites:
Once the fritter bites are cool enough to handle, dip them in the glaze or drizzle the glaze over them.
Place the glazed fritter bites on a cooling rack set over a baking sheet to allow the glaze to set.