Preheat your oven to 350°F (175°C). This ensures that your Banana-Pineapple Bread bakes evenly.
Lightly grease a 9x5-inch loaf pan with oil or line it with parchment paper for easy removal.
In a medium bowl, whisk together the flour, baking powder, and salt. This helps to evenly distribute the leavening agent throughout the flour.
In a large mixing bowl, combine the mashed ripe bananas, crushed pineapple, coconut sugar, eggs, avocado oil, and vanilla extract. Mix well until fully combined.
Gradually add the dry ingredients to the wet mixture, stirring gently with a rubber spatula until just combined. Be careful not to overmix; a few lumps are perfectly fine.
Pour the batter into the prepared loaf pan, smoothing the top with the spatula. Bake for 55-60 minutes, or until a toothpick inserted in the center comes out clean.
Allow the Banana-Pineapple Bread to cool in the pan for about 10 minutes, then transfer it to a cooling rack to cool completely. Slice and serve as desired!