In a large bowl, cream the butter and sugar together with a hand mixer until light and fluffy.
Add the eggs and vanilla, and mix to combine.
In a large bowl, whisk together the flour, baking powder, salt, cinnamon, and nutmeg.
Add half of the flour mixture to the butter mixture, followed by half of the milk. Stir to combine.
Repeat with the remaining flour mixture and remaining milk.
Fold in the diced apples.
Spoon the dough into the prepared mini muffin tin, filling each cup about ¾ of the way up.
Bake for 13–15 minutes, or until a toothpick inserted into the center comes out with dry crumbs. Let cool for 5 minutes and remove from the pan.
Repeat with any remaining batter.
While the fritters are baking, whisk together the powdered sugar and 2 tablespoons maple syrup to create a pourable glaze. Add additional maple syrup if the mixture is too thick.
Dip the tops of each slightly cooled fritter into the maple glaze.
Serve right away, or allow the fritters to cool completely and the maple glaze to dry, and serve.