Filling: 

1. Wash berries and pat dry with a clean towel to remove excess moisture. 
2. In a small saucepan over medium heat, bring all ingredients except chia seeds to a boil. Reduce heat and simmer for 10 minutes, stirring often. Softly mash the mixture with the back of a wooden spoon to achieve a jam-like consistency. 
3. Remove from heat and stir in chia seeds. Let sit 30 minutes to cool and thicken.

Crust: 

1. Preheat oven to 350 F and line an 8x8 inch pan with parchment paper.
2. In a food processor, pulse all dry ingredients until a crumbly mixture forms. Add wet ingredients and continue to pulse until well incorporated. You may need to transfer to a large mixing bowl and knead lightly by hand before pressing into pan.
3. Press 1/2-2/3 of mixture into pan. Spread berry mixture over top to form an even layer.
4. Generously sprinkle remaining crumble over the top.
5. Bake for 33-37 minutes, until golden brown on top.
6. Let cool in pan at room temperature for several hours - until completely cooled. Carefully remove from pan and slice into bars.