Preheat the oven to 375F and line a baking sheet with parchment paper.
Add the peaches, cornstarch, 3 tablespoons of maple syrup, lemon juice and half a teaspoon of cinnamon to a bowl. Toss until the peaches are evenly coated.
In a separate bowl, add the oats, oat flour, 3 tablespoons of maple syrup and 1/2 teaspoon of cinnamon. Toss until mixed thoroughly.
In six 12oz mason jars, add the mixed peaches until they are three quarters of the way full. Top with a few tablespoons of the crumble.
Place on the parchment paper lined baking sheet in case they bubble over, and bake for 35 minutes. Enjoy immediately with coconut whipped cream, or allow to cool and store covered in the fridge for up to 3 days.