Preheat oven to 350 degrees.
Place the blueberries in a baking dish and stir in the tapioca starch, vanilla, cinnamon, and lemon juice.
6 cups blueberries, 2 tablespoons tapioca starch, 1 tablespoon lemon juice, 1 1/2 teaspoons vanilla extract, 1 teaspoon cinnamon
In a medium bowl, stir together the oats, coconut sugar, maple syrup, oat flour, almond flour, coconut oil, and salt. Spread the mixture loosely across the top of the fruit.
2 1/2 cups rolled oats, 1 1/4 cup almond flour, 1 1/4 cup oat flour, 2/3 cup coconut oil, 1/2 cup maple syrup, 1/2 cup coconut sugar, 1/4 teaspoon salt
Bake for 40 minutes or until the blueberries are bubbling and the top is just beginning to turn golden brown.
Let rest for 5-10 minutes and then enjoy warm.