Bananas. As much as I like them, I always seem to have a few over-ripe ones lying in the fruit bowl. Why? Because the whole bunch ripens at exactly the same time and no matter how much you like banana's, five in one day is too many.  Since I hate wasting food, my solution is to transform them into a delicious batch of banana muffins. Not just any muffins though. These ones have a sweet and crunchy brown sugar crumble topping that transforms them from boring to blissful! These muffins are best served the day you make them, preferably warm from the oven with a generous smudge of...