Preheat oven to 450 degrees. Place a cast iron skillet stove and place on medium-high heat. Add coconut oil, and melt (make sure it coats the whole pan).
Toss sliced apples with 1/2 tsp. cinnamon. Add to cast iron skillet and cook until apples are soft, about 5 minutes. When apples are done, set aside in a seperate bowl.
Add cassava flour, eggs, pumpkin, milk, baking powder and other 1/2 tsp. cinnamon to a blender/food processor. Blend until mixture is smooth. Pour into cast iron skillet. Place apples on top.