Preheat the oven to 350°F and place the rack in the middle. Grease an 11 x 7-inch baking dish with coconut oil.
In a small mixing bowl, combine the coconut flour, arrowroot flour, baking powder, and salt. Set aside. Peel, core, and dice the apples. Chop the prunes.
In a large mixing bowl, combine the pumpkin puree, coconut milk, maple syrup, cinnamon, ginger, apples, and prunes. Mix well with a rubber spatula.
Add the gelatin powder and warm water to a cup. Stir well, making sure the powder is completely dissolved, then incorporate the gelatin mixture into the pumpkin batter.
Add the dry ingredients to the pumpkin batter and mix well with a rubber spatula or your hands.
Transfer the batter to the prepared baking dish and bake in the oven for 35 minutes, until the edges turn golden brown and a toothpick inserted close to the center comes out dry.
Allow to cool completely before slicing.