This actually came out very good. Im not a big banana bread fan, but this was good. Christopher liked it as well.
The only change I made was to add a tsp of cinnamon and subed 1/3 of the sugar for brown sugar
1 cup mashed bananas
1 cup sour cream
1/4 cup margarine
1 1/3 cups white sugar
1 teaspoon vanilla extract
2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1/4 teaspoon salt
Preheat oven to 350 degrees F (175 degrees C). Grease and flour one 9x13 inch pan, or two 7x3 inch loaf pans. (I used a bunt pan, it took about 45 minutes to bake)
Combine banana and sour cream. Set aside. In a large bowl, cream together the margarine and sugar until smooth. Beat in the eggs one at a time, then stir in the vanilla and banana mixture. Combine the flour, baking soda, baking powder and salt; stir into the banana mixture. Spread the batter evenly into the prepared pan or pans.
Bake for 50 minutes in the preheated oven, or until a toothpick inserted into the center of the bread comes out clean.