Preheat oven to 350°.

In medium bowl, mash banana well.

To banana, add shortening, sugar, and egg. Mix well.

Add remaining ingredients and mix well, being sure to remove all lumps from the batter.

Fill greased muffin tins about 2/3 full. Sprinkle a small amount of brown sugar on top of each muffin.

Bake 15-20 minutes, until lightly browned and a toothpick tests clean when inserted in muffin. Freeze extra muffins.