Slice the top off of the apple so it’s flat and core 2/3 of the way down until you remove all the seeds. Hollow out the apple allowing about 1/4“ of apple. Place in a greased 8x8” square pan.
Mix together the oatmeal, sugar, butter, pecans, flax, raisins, cinnamon and salt. Stuff the apple holes. Drizzle with maple syrup and top with a sprinkle of cinnamon.
Pour the apple cider, juice or water into the bottom of the dish and mix in the extra cinnamon. Cover with foil and bake for 35-40 minutes or until tender when pricked. Uncover and bake for an additional 5-10 minutes to let the tops brown up. Serve with yogurt, whipped cream or ice cream.