Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

In a large mixing bowl, cream together softened unsalted butter and granulated sugar until light and fluffy, about 3-4 minutes.

Add in one egg and a splash of vanilla extract, mixing until fully incorporated.

In a separate bowl, whisk together all-purpose flour, baking soda, and salt. Gradually add dry mixture into the butter mixture until a soft dough forms.

Shape the dough into 1½ tablespoon balls, flattening them into disks on the prepared baking sheets.

Place a canned pineapple ring on top of each disk, pressing down slightly, then sprinkle with sugar.

Bake for 12-14 minutes until edges are lightly golden and centers remain soft.

Cool on the sheets for 5 minutes, then transfer to a wire rack to cool completely.