Great summer treat that is naturally vegan, just make sure any toppings are vegan too, if that's a consideration for your guests. And you can substitute other fresh fruits you have in season. Peaches, strawberries, or raspberries would work equally well.
Preheat oven to 375°. Lightly grease an 8 or 9 inch baking pan, casserole dish or deep dish pie plate. If preferred, use ramekins.
In a bowl, stir together the flour, oats, sugar, and cinnamon. Pour melted butter over the mixture and stir to combine.
In a small bowl, whisk together ½ c sugar, cornstarch, cinnamon, and lemon zest until combined. Add the blueberries and stir to combine. Drizzle the lemon juice over the blueberry mixture and gently stir to coat.
Pour the blueberry mixture into the prepared pan(s). Sprinkle the crumble topping over the blueberries leaving some large chunks.
Bake 40-45 minutes or until the berries are bubbling and topping is golden brown. Tent with foil while baking if it is browning too quickly. Allow crisp to cool for 15 minutes. Serve warm topped with vanilla ice cream, whipped cream, or plain.
Notes
To keep this recipe vegan and/or lactose-free, be sure to use plant-based butter. You can also use plant-based ice cream, or just put the toppings on the side and let your guests choose.This can easily be made gluten-free by substituting a one-for-one gluten-free flour.