01 -
Pour 2 inches of vegetable oil into a heavy-bottomed pot or Dutch oven. Heat over medium heat to 350°F (175°C), using a clip-on thermometer to monitor. Wait until the temperature holds steady before adding batter.
02 -
Whisk the flour, baking powder, cinnamon, nutmeg, salt, and sugar together in a large bowl until evenly blended with no clumps.
03 -
In a separate bowl, whisk the milk, egg, and vanilla until smooth. Pour into the dry ingredients and stir just until a thick batter forms. A few small lumps are fine. Do not overmix.
04 -
Add the finely diced apple to the batter and fold with a spatula until the pieces are evenly distributed throughout.
05 -
Drop rounded tablespoons of batter into the hot oil, 5 or 6 at a time. Fry for 2 to 3 minutes per side until deep golden brown, turning with a slotted spoon. Drain on a wire rack or paper towels. Return the oil to 350°F between each batch.
06 -
Whisk the powdered sugar, cinnamon, milk, and vanilla in a shallow bowl until smooth. Start with 3 tablespoons of milk and add more by the teaspoon until the glaze drips slowly from a spoon.
07 -
While fritters are still warm, dip each one in the glaze or drizzle generously over the top. Set on a wire rack for 3 to 4 minutes for the glaze to set, then serve immediately.