Preheat oven to 325°F (160°C). Grease two 8x4-inch loaf pans.

In a large bowl, combine sugar, oil, and eggs. Mix well.

Stir in mashed bananas and orange juice until combined.

In a separate bowl, whisk together flour, baking powder, baking soda, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just moistened. Do not overmix.

Stir in chopped walnuts.

Pour the batter evenly into the prepared loaf pans.

Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.

Let the bread cool in the pans for 10 minutes before transferring to a wire rack to cool completely.

Wrap cooled loaves securely in plastic wrap and then foil for freezing or storage.