Preheat your oven to 350°F (175°C).
Line a baking sheet with parchment paper.
In a medium bowl, whisk together the all-purpose flour, baking soda, and salt.
In a separate large bowl, mix melted and cooled butter with granulated sugar and brown sugar until well combined. Add in the egg and egg yolk, mixing until smooth. Stir in lemon juice, lemon zest, vanilla extract, and lemon extract.
Gradually add the dry ingredients to the wet mixture. Use a rubber spatula to fold them together until just combined.
Using a cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheet.
Bake the cookies for 10-12 minutes, or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a cooling rack.
