Preheat the oven to 350°F (175°C).

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

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

Beat in the egg and vanilla extract, then mix in the crushed pineapple.

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

Drop rounded tablespoons of dough onto a baking sheet lined with parchment paper.

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

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