Combine all the ingredients in a food processor and pulse until combined and clumps begin to form. Transfer to a bowl, and put in the fridge or freezer to chill.
Cook the peaches
Preheat the oven to 400 degrees. On the stove, over medium heat, in a cast iron pan combine all the ingredients for the peaches and cook, covered, for 10 minutes. Remove the lid and cook for an additional 15 minutes.
Thicken the peaches
In a small bowl combine the water and arrowroot startch. Turn off the heat on the peaches and remove them from the stove and set aside until they stop bubbling. Add the starch slurry into the peaches and mix well.
Cook the cobbler
Immediately sprinkle the crumble evenly over top the peaches until covered uniformly. Put in the 400 degree oven for 10 minutes or until the topping has turned slightly golden brown. Allow to cool for 10 minutes, serve warm.