Get Started:
Preheat your oven to 350°F (175°C).
Line baking sheets with parchment paper or silicone baking mats.
Make the Pineapple Filling:
In a saucepan, combine the crushed pineapple, sugar, and cornstarch.
If using, add the lemon juice.
Cook over medium heat, stirring constantly, until the mixture thickens and becomes translucent (about 5-7 minutes).
Remove from heat and let it cool completely.
Prepare the Cookie Dough:
In a large mixing bowl, cream together the softened butter, granulated sugar, and powdered sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Assemble the Cookies:
