Kristie found this recipe on Crepes of Wrath Site.  This is a wonderful muffin recipe, and it makes heaps too.

Ingredients

2 1/2 cups all-purpose flour
1/2 cup sugar
1/2 cup packed brown sugar
1 tablespoon baking powder
3/4 teaspoon salt
1/4 teaspoon cinnamon
2-3 large, ripe bananas (I really suggest using 3)
1 cup milk
3/4 cup smooth or crunchy peanut butter (I used crunchy and it was fantastic)
3 tablespoons canola oil
1 teaspoon vanilla
1 large egg
1 cup milk chocolate chips

Method

1. Preheat the oven to 350 degrees F and line and/or grease 12 muffin tins.
2. In a large bowl, combine the flour, sugar, brown sugar, baking powder, salt and cinnamon and set aside.
3. In another large bowl, combine the mashed bananas, milk, peanut butter, egg, oil, and vanilla and mix well.
4. Gradually mix in the dry ingredients until just moistened, then fold in the chocolate chips.
5. Bake for 22-25 minutes or the muffins are slightly golden and a toothpick comes out clean. Allow to cool a bit before removing from the tins, then either serve warm or allow to finish cooling.