Preheat your oven to 350°F (175°C) and grease a 9x5-inch loaf pan.

In a bowl, whisk together all-purpose flour, granulated sugar, baking powder, baking soda, salt, and shredded coconut until well combined.

In another bowl, mix melted butter, eggs, vanilla extract, buttermilk, and crushed pineapple until smooth.

Pour the wet mixture into the dry ingredients and stir until just combined; some lumps are okay.

Pour the batter into the prepared loaf pan, spreading it evenly.

Bake in the preheated oven for 55-60 minutes until a toothpick comes out clean.

Let the loaf cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.