I took a Paula Dean recipe and substituted gluten free flour and margarine and it turned out awesome!
I added a 1/4 of dairy free chocolate chips in mine one time and that was great as well.

Ingredients:

2 cups gluten free flour
1 cup sugar
1 teaspoon salt
1/2 cup margarine
4 very ripe bananas
2 teaspoons baking powder
1 teaspoon baking soda
2 eggs
1/2-1 cup chopped pecans

 
Directions:

  1. Preheat oven to 350 degrees.
  2. Mix dry ingredients.
  3. Mix butter, bananas & eggs.
  4. Mix dry ingredients into banana mix and stir in nuts.
  5. Bake 40-45 minutes.