Preheat the oven to 350?F (175?C).

In a mixing bowl, whisk together the flour, baking powder, baking soda, and salt.

In another bowl, cream the softened butter and sugar until light and fluffy.

Add the egg and vanilla extract, mixing until well combined.

Stir in the crushed pineapple.

Gradually add the dry ingredients to the wet mixture, mixing until just combined.

Drop tablespoon-sized balls of dough onto a baking sheet lined with parchment paper.

Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden.

Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.