Step 1

Preheat your oven to 375˚F.

Step 2

To a large mixing bowl add all the filling ingredients (blueberries, maple syrup, lemon juice, water, vanilla, cinnamon, and cornstarch). Mix until everything is well combined and evenly coated. Transfer the mixture 9×13 baking dish (affiliate link).

Step 3

Add the topping ingredients (oats, almond flour, brown sugar, cinnamon, nuts, maple syrup, and applesauce) to another bowl and stir. Make sure everything is mixed well. Use your hands if you have to.

Step 4

Spread the crumble topping with your hands evenly on top of the blueberry filling. Place in the oven and bake uncovered for 45-55 minutes until the filling is bubbling and the topping is lightly browned.