Preheat oven to 350°.
Whisk together the first six ingredients.
In a separate bowl, whisk bananas, oil and egg until blended. Add to flour mixture; stir just until moistened. Fold in chocolate chips.
Fill greased or paper-lined muffin cups three-fourths full.
Bake until a toothpick inserted in center comes out clean, 20-25 minutes.
Cool 5 minutes before removing from pan to a wire rack. Serve warm.