Preheat oven to 190 deg C (fan-forced) and line a 19x29cm baking tin with baking paper so that it overhangs the sides by a couple of cm’s.
Add ground flaxseeds and water to a small bowl, mix to combine and allow to sit for 5 minutes to thicken.
In a large bowl, mash the bananas then add the milk, apple sauce, and vanilla and mix to combine. Then add the oats, baking powder, cinnamon, salt and flaxseed mixture and mix to combine. Fold in the berries until evenly dispersed.
Transfer mixture to the prepared baking tin and bake for 25 minutes or until the edges have started to brown and the top has set. Allow to cool for at least 10 minutes before cutting into 8-10 squares.
Variation: Add 1-2 tsp lemon zest for a fresh citrus lift.
Find it online: https://eatplantsforhealth.com.au/berry-banana-breakfast-bake-2/