Preheat oven to 350. Pam spray a bundt pan, one 9x13 inch pan, or two 7x3 inch loaf pans. 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.
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