Store leftovers in an airtight container at room temperature for up to 2 days, or refrigerate for up to 4 days. Reheat slices in the microwave for 15-20 seconds for best texture.
For a gluten-free version, substitute the all-purpose flour with a 1:1 gluten-free baking flour blend.
You can add a teaspoon of lemon juice to the chopped apples to prevent browning and enhance the flavor.