Healthy Breakfast Blueberry Oat Crumble Bars

For the Blueberry Filling:

400 gr frozen blueberries, then thaw them down
30 g or 2 tablespoons ground flaxseed

For the Crust:

two ripe bananas, medium sized
200 gr rolled gluten-free oats
200 grams oat flour, choose the gluten-free flour
two teaspoons of ground cinnamon
salt
30 gr or 2 tablespoons of maple syrup
30 gr or 2 tablespoons of olive oil

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Healthy Breakfast Blueberry Oat Crumble Bars