Preheat oven 350 degrees.
Grease 3 mini loaf pans.
Mix flour, sugar, baking soda and salt. In another bowl mix bananas, oil, yogurt, eggs and extract. Add to flour mixture, stir just until moistened. Stir in nuts. Pour into greased pans. Bake 35-40 minutes or until toothpick when inserted comes out clean.