Preheat oven to 350°F (175°C).

Grease a 9 x 5 x 3-inch loaf pan.

In a large bowl, whisk together flour, oats, sugar, baking powder, baking soda, cinnamon, and salt.

Stir in chopped nuts.

In a medium bowl, mash bananas.

Add crushed pineapple (undrained), oil, and eggs to the mashed bananas.

Mix well.

Add the wet ingredients to the dry ingredients all at once.

Stir just until the liquid is absorbed and the mixture is thoroughly moistened (do not overmix).

Pour the batter into the prepared loaf pan.

Bake for 50 to 55 minutes, or until a wooden toothpick inserted into the center comes out clean.

Cool in the pan for 5 minutes.

Loosen the edges of the bread with a knife.

Turn the bread out onto a cooling rack to cool completely.

Glaze, if desired.