Preheat the oven to 350?F (175?C) and grease a loaf pan.

In a mixing bowl, whisk together the dry ingredients: flour, sugar, baking soda, baking powder, and salt.

In another bowl, combine the wet ingredients: crushed pineapple, applesauce, egg, vegetable oil, and vanilla extract.

Pour the wet ingredients into the dry ingredients and mix until just combined; do not overmix.

Pour the batter into the prepared loaf pan.

Bake in the preheated oven for 60 minutes or until a toothpick inserted into the center comes out clean.

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