Preheat oven to 350F and line an 8×8 baking pan with parchment paper.
Combine all crust/crumble ingredients in a mixing bowl.
Press 3/4 of the mixture into your baking pan (press down firmly so the crust with hold together nicely). Bake for 10mins, then remove from oven to let cool slightly
While crust is baking, add blueberries, arrowroot powder, maple syrup and lemon juice to a saucepan over medium heat. Once blueberries begin to soften, start to mash them with a fork. Reduce heat to a simmer and cook for another 5mins.
Turn off heat and stir in chia seeds. Let sit 5mins to thicken.
Pour blueberry filling over top of your crust layer and sprinkle your remaining crumb topping all over top.
Bake for 20-25mins until filling is bubbly and top is lightly golden.
Let cool completely before slicing into squares. Store leftovers in an airtight container in the fridge!
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