Preheat oven to 350 degrees and spray a 12-count muffin pan with cooking spray or line with cupcake liners. Mix milk and vinegar in a small bowl and set aside.In a large bowl combine both flours, oatmeal, flaxseed, brown sugar, baking soda, baking powder, salt, and cinnamon.In a small bowl combine the mashed banana, egg, applesauce, molasses, and milk mixture. Add wet ingredients to dry and stir until just combined. If you are adding any mix-ins, add them here and stir again until evenly distributed.Divide mixture evenly among the 12 muffin cups and bake for about 17-18 minutes. Remove and let cool or devour warm if you just can't wait!