In a large bowl, combine the flour, sugar, baking powder, baking soda and salt. In another bowl, whisk the egg, oil, yogurt and vanilla. Stir into dry ingredients just until moistened. Fold in bananas and chocolate chips.
Fill greased or paper-lined muffin cups two-thirds full. Bake at 350° for 22-25 minutes or until a toothpick inserted in the center comes out clean. Cool for 5 minutes before removing from pans to wire racks.
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