This was a recipe I found on the Food Network and it was really good! That link will tell you exactly how to make them perfectly but I did it a little more simply. The recipe says to bake 18-20 minutes but mine were plenty well done by 15 minutes.
3 overripe bananas
1 cup brown sugar
3/4 cup butter (recipe says melted and cooled, I just added room temp butter)
2 eggs
1 tsp pure vanilla extract
Mix wet ingredients well before adding dry ingredients and then don't overmix.
2 cups flour
1 1/2 tsp baking soda
1/2 tsp salt
Fold in nuts and bananas
2 mashed bananas (still kind of chunky)
1/2 cup chopped pecans
Bake 14-16 minutes at 375 degrees F. Recipe says to butter the muffin tins, I just used liners.