In a 9x13 inch baking pan, grease the sides and bottom with nonstick cooking spray. Spread the peach slices out evenly around the bottom of the pan. In a small bowl, add the ingredients in the peach filling and stir until combined. Then sprinkle over the peaches and fold into the peaches until they are coated with the filling mixture.
In a blender or food processor, add in the ingredients for the cobbler topping, except the butter and the boiling water. Combine together. Add in the butter cubes into the cobbler topping and pulse in the blender until combined. Then while the blender/food processor is on it's lowest setting, pour in the boiling water slowly while it combines with the rest of the cobbler topping ingredients. Once combined, spread over the peaches.
In another small bowl, add in the ingredients for the crumble topping and stir until combined. Spread over the top of the cobbler topping evenly. Bake at 375℉ for 45-55 minutes or until the topping is crispy and the juices are bubbling.
Let sit for 5-10 minutes until slightly cooled. Serve with whipped cream or vanilla bean ice cream.