Preheat Oven: Start by preheating your oven to 350°F (175°C).
Prepare the Blueberry Filling: In a large bowl, combine the blueberries, lemon juice, maple syrup, cornstarch (or arrowroot powder), and vanilla extract. Mix well to ensure the blueberries are evenly coated. Transfer this mixture to a 8x11-inch Baking dish, spreading it out evenly.
Prepare the Crumble Topping: In another bowl, combine the rolled oats, almond flour, ground cinnamon, and salt. Add the unsweetened applesauce and maple syrup, mixing until everything is well combined. Fold in the chopped nuts and shredded coconut if you’re using them. This mixture should be crumbly and ready to sprinkle over the blueberries.
Assemble the Crisp: Sprinkle the crumble topping evenly over the blueberry filling in the baking dish.
Bake: Place the dish in the preheated oven and bake for 35-40 minutes, or until the topping is golden brown and the blueberries are bubbly. If the topping starts to brown too quickly, cover the dish with foil for the remaining baking time.
Serve: Once baked, let the blueberry crisp cool for a few minutes before serving. Enjoy it warm, optionally with a dollop of non-dairy yogurt or a scoop of your favorite plant-based ice cream.