Preheat the oven to 350 degrees F.
Prepare an 8 or 9-inch cast iron skillet or baking dish by coating with a thin layer of coconut oil.
Mix all filling ingredients together in a large bowl, then pour mixture into skillet, spreading out evenly.
Using a food processor, prepare the crumble. Pulse the pumpkin seeds, walnuts, and pecans to break down into smaller pieces. *You can also do this step by hand, roughly chopping all nuts and seeds, leaving a finer texture.
Add remaining ingredients and pulse several more times until you get a crumbly texture.
Sprinkle the crumble over the top of the peaches in the skillet.
Put in the oven and bake until the filling is bubbling, about 40-45 minutes.
Let cool for 5 minutes and serve with vanilla ice cream or eat plain. Enjoy! :)