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To make filling, place blueberries in a saucepan over medium heat with sugar, water,and tapioca starch. Cook for 7-8 minutes, stirring every few minutes, until blueberries are broken down and thickened. Remove from heat and set aside.
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For crust: Line an 8x8 pan with parchment paper and set aside. Preheat oven to 350 F.
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In a large bowl, whisk together coconut flour and cassava flour. Add softened coconut oil and combine together with a fork until crumbly and well mixed. Stir in egg, honey and water until well combined. The batter will be crumbly but will hold together when pressed.
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Press the dough into the bottom of the pan and bake for 10 minutes.
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While the dough prebakes mix together all crumble ingredients with a fork.
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Top the prebaked crust with the blueberry mixture and pour the crumble evenly over the filling. Bake for 18-20 minutes, or until lightly browned.
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Allow to cool for at least 15 minutes then remove from pan, slice, and enjoy! Store leftovers in the fridge for up to 5 days.