Preheat the oven to 350°F (175°C). In a small bowl, mix the melted butter, brown sugar, and cinnamon until combined.

Spread the mixture evenly on the baking sheet. Arrange the pineapple rings on top.

In a mixing bowl, cream together the softened butter and granulated sugar using an electric mixer until light and fluffy.

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

In another bowl, whisk together the flour, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Using a cookie scoop, drop spoonfuls of the cookie dough over the pineapple rings on the baking sheet.

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

Remove from the oven and let cool for a few minutes before inverting onto a serving platter.