In a large bowl combine mashed bananas, milk, oil, eggs, sugar, vanilla and cinnamon and mix well.
Add flour, flax, baking soda, salt and chocolate chips and stir until just combined.
Spoon into greased or lined muffin tins. Recipe makes 12 large muffins (or 14-16 smaller muffins)
Bake at 375 for 18-20 minutes.
