Core and chop the apples into small pieces and place them to the side. In a large mixing bowl combine the wet ingredients by whisking together the sourdough discard, milk, eggs, softened butter, sugar, and vanilla.
In a separate bowl, mix the flour, salt, cinnamon, baking powder, and nutmeg. Add dry ingredients to the wet and stir until just combined (don’t overmix). Fold in the chopped apples.
In a deep skillet or Dutch oven, heat 2–3 inches of oil on medium heat to 350. Once the oil temperature is right, drop a ¼ cup of batter into the hot oil, flatten slightly with a potato masher or the back of a spoon. Allow to cook for 2 minutes.
Flip the fritters and cook the other side for another 2 minutes. For best results fry in small batches. Remove with a slotted spoon and drain on a wire rack or paper towels.
While still warm, whisk together the vanilla glaze ingredients until smooth and drizzle or dip the fritters, then place them on parchment paper or a wire rack. Best enjoyed fresh and warm!