If using flax eggs, Mix the flax & water together & set aside to thicken 5-10 mins.
In a large bowl, mix together the dry ingredients.
Mash (or even blend) the banana until super mashed.
Mix in the remaining wet ingredients, then add to the bowl with the dry.
Mix well.
Spread the dough into a bread loaf pan for banana bread or an 8x8 pan for bars.
Mix together the crumble ingredients.
Sprinkle it over the bars - gently press it into the top.
Bake at 350f for 35-45 mins until a toothpick inserted comes out clean.
Check on it around 30 mins.
It should be firm to touch in the center.
Let cool & top with the glaze.
