1. In a medium bowl, whisk together the unsweetened apple sauce, dairy-free milk, apple cider vinegar, and vanilla extract until well combined.

2. In a separate large bowl, whisk together the gluten-free all-purpose flour blend, granulated sugar, baking powder, ground cinnamon, ground nutmeg, and salt. Make sure there are no lumps and all ingredients are evenly distributed.

3. Pour the wet ingredients into the dry ingredients. Stir with a spoon or spatula until just combined. Be careful not to overmix; a few small lumps are perfectly fine.

4. Gently fold the finely diced apple into the batter. Ensure the apple pieces are evenly distributed throughout the mixture.

5. Pour about 2-3 inches of vegetable or canola oil into a large, heavy-bottomed pot or Dutch oven. Heat the oil over medium heat until it reaches 350 F (175 C).

6. Carefully drop spoonfuls of batter (about 1-2 tablespoons each) into the hot oil. Do not overcrowd the pot; fry in batches to maintain oil temperature. Fry for 2-3 minutes per side, or until golden brown and cooked through. Use a slotted spoon or spider to turn them gently.

7. Once golden, remove the fritters from the oil and place them on a wire rack lined with paper towels to drain any excess oil. While they are still warm, prepare the glaze by whisking powdered sugar with 2-3 tablespoons of dairy-free milk until smooth. Dip each fritter into the glaze or drizzle the glaze over them. Serve immediately.