Preheat the oven to 350 F
Place the sliced peaches into a 10 x 7" baking dish or pie dish. Toss them together with the tapioca flour, cinnamon and maple syrup then set aside.
For the topping, combine all of the ingredients together in a bowl except for the butter and mix well.
Add in the sliced butter cubes and start mashing the mixture with your hands, slowly breaking up the butter and creating a crumble topping. The mixture may feel dry for the first couple of minutes, but continue to work the mixture with your hands until the butter is evenly incorporated.
Sprinkle the topping over the peaches evenly
Cover the dish with foil and bake for 30 minutes covered, then another 10-15 minutes uncovered.
Serve warm with your favorite ice cream or whipped cream.
Refrigerate leftovers for up to 1 week.