In a large mixing bowl or stand mixer combine all ingredients for the oat topping. Mix together until there are no pockets of dry ingredients, then set aside and allow to cool while preparing the apple filling.
Prepare the apples by first peeling them, then slice the flesh away from the core in 4 large chunks. Place the apples flat side down and slice into ¼ -inch slices. Place the cut apples in an 8x8 baking dish.
Add coconut sugar, ground cinnamon, and ground ginger to the apples. Stir to evenly coat in the sugar and spices.
Once the butter in the oat topping has solidified enough to crumble, grab small handfuls of the topping and crumble evenly over the apples in the baking dish.
Place in the oven and bake for 35-45 minutes at 350 degrees F (40 was perfect for my oven), or until the crumble becomes slightly crispy, and the apples have cooked down.
Remove from the oven and allow to cool for about 15 minutes, or until the liquid reabsorbs into the apple mixture and becomes thicker.