Preheat oven to 350 degrees F (175 degrees C).

Grease two loaf pans.

In a large bowl, combine the Duncan Hines butter cake mix, melted butter, eggs, minced nuts, mashed bananas, and maple flavoring.

Mix well until all ingredients are fully incorporated.

Pour the batter evenly into the prepared loaf pans.

Bake for 40 to 45 minutes, or until a wooden skewer inserted into the center comes out clean.

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

Slice and serve.