Preheat the oven to 350' and grease your cast iron skillet with a little coconut oil or butter
Add the sliced peaches, blueberries, tapioca starch, sugar, lemon juice and lemon zest in a large bowl and mix together until the fruit is fully coated. Add mixture into the skillet and spread into an even layer
Add the gluten free flour, oats, coconut sugar, walnuts, cinnamon and salt into the food processor. Pulse until combined, then add in the butter and vanilla extract and pulse again to combine
Add 1 Tbls of cold water to the mixture and pulse to combine. Mixture should be like wet sand (not too wet) You can a little more water if needed. Put the mixture evenly on top of the fruit in the skillet. Bake for 25-35 minutes. Topping should be nicely browned and crisped on the top
Let cool for 10-15 minutes before serving. Top with vanilla ice cream and enjoy!
Notes
You can use regular all purpose flour if you do not need to be gluten freeCan also use cornstarch instead of tapioca starch