Preheat the oven to 375F.
Peel and slice your peaches into no more than1/2" pieces. Add to a bowl.
Pour in the apple juice and squeeze the lemon over the peaches.
Add flour, cinnamon, and coconut sugar. Fold this into the peaches and stir until thoroughly mixed.
Next, combine the oats, flour, coconut sugar,cinnamon, salt, vanilla, and butter in a separate bowl. Set in the fridge until you are ready touse.
Butter your iron skillet. Pour the filling mixture into the skillet and spread evenly.
Lastly, take the crumble topping and sprinkle it all over the filling mixture.
Bake for 55-60 minutes or until the topping is all nice and bubbly.