Make crisp topping in a large mixing bowl. Add the flour, oats, diced vegan butter, light brown sugar and cinnamon. Using a pastry cutter, a fork, or your hands, combine until you have a rough mixture with no loose flour. It's ok to have some small chunks of butter in the crisp mixture.
¾ cup (95 g) all purpose flour, ¾ cup (60 g) oats, ½ cup (110 g) vegan butter, ½ cup (100 g) light brown sugar, ½ teaspoon ground cinnamon
Roughly chop pecans and stir into crisp topping.
½ cup (60 g) pecans
Prepare peaches. Peel if desired, then slice in half, remove pit and cut into slices.
4-5 large peaches
Make peach filling directly in a 8 x 8 inch (20cm) baking dish, by stirring together sliced peaches, granulated sugar (to taste) and cornstarch.
1-4 tablespoons granulated sugar, 1 tablespoon cornstarch
Spread crisp mixture evenly on top of the peaches.
Bake at 350℉ / 180℃ for 40 minutes, until the top is golden brown and the peach mixture is bubbling and looks thickened.
Serve warm and enjoy, with a scoop of vegan vanilla ice cream!