Prepare the apples. Peel and dice both apples. Toss with 2 tablespoons of lemon juice, spread evenly over a ventilated dehydrator sheet, and dehydrate at 165°F for 20–30 minutes, or until slightly softened.
Make the flour. While the apples soften, grind the oats, walnuts, and flaxseed individually into a fine flour using a high-speed blender or food processor. Combine in a large mixing bowl.
Prepare the fruit paste. Blend the prunes with 3 tablespoons of water until smooth. If the prunes are particularly dry, soak them briefly before blending.
Mix the dough. Add half of the softened apples, prune paste, coconut milk, coconut nectar, cinnamon, and salt to the flour mixture. Mix thoroughly until a thick, moldable dough forms.
Shape the loaf. Form the dough into a compact loaf and place it on a dehydrator sheet.
Prepare the topping. Combine the remaining softened apples with coconut sugar, coconut nectar, cinnamon, and coconut oil.
Add the topping. Press the cinnamon apple mixture firmly onto the loaf. Dehydrate at 165°F for 1–2 hours, until the topping begins to adhere.
Slice and finish. Carefully cut the loaf into approximately 1-inch slices. Reduce the dehydrator temperature to 115°F and continue dehydrating for another 1–2 hours, or until the bread is firm on the outside while remaining moist and chewy inside.
Serve. Enjoy immediately or gently warm before serving.