Preheat oven to 350 degrees F. Coat a 7x6 baking dish with nonstick cooking spray or vegan butter. You can also place a piece of parchment paper in the baking sheet to make cleaning up easier. Set aside.
Peel peaches (optional), or simply remove the pits and slice.
In a big mixing bowl, gently stir with a rubber spatula peach blueberry filling ingredients: sliced peaches, blueberries, lemon juice and lemon zest, coconut sugar, vanilla extract, arrowroot starch, and cinnamon. Pour the peach mixture into the prepared baking sheet. Set aside.
In another mixing bowl, mix the oat crisp ingredients: rolled oats, oat flour, coconut sugar, cinnamon, salt, and vegan butter. Use hands to work in the cubed butter until it forms into a crumbly dough.
Crush the dough with your fingers and spread evenly on top of the fruit mixture.
Bake for 35-40 minutes at 350 F, or until bubbly and golden brown.
Remove from the oven and cool for 10 minutes. Serve warm with vanilla ice cream or yogurt on top.
Notes
*Coconut sugar – sub brown sugar, maple sugar **arrowroot starch – sub corn starch **oat flour – sub gluten free flour equal parts, or all-purpose flour ***vegan butter – you can also regular butter if not following vegan dietary restriction