Preheat your oven to 165C.
Grease your loaf pan.
Mix mashed bananas, vanilla essence, sugar, buttermilk, and oil until combined
In a large mixing bowl whisk together the flour, baking soda, salt, and chia seeds.
Add wet ingredients into the dry ingredients.
Mix until just combined.
Pour batter into prepared loaf pan.
Bake for 1 hour 20 mins or until skewer inserted comes out clean.