Combine all dry ingredients flour, flax seeds, sugar, baking powder, baking soda, cinnamon and salt.
In a separate bowl combine all wet ingredients bananas, eggs, yogurt, butter and vanilla.
Add wet ingredients to dry ingredients until well combined.
Spray a mini muffin tray with non-stick spray fill tins half way with muffin batter bake 350 for 12-15 minutes until a toothpick comes out clean from the muffin.