Preheat the oven to 350 degrees F and line baking sheets with parchment paper.
In a large mixing bowl with an electric mixer or in the bowl of a stand mixer with a paddle attachment, cream the butter and sugar together until combined.
Add the egg, egg yolk, vanilla extract, corn syrup, lemon juice and lemon zest.
Whisk together the flour, baking powder and baking soda in a medium bowl until combined.
Add the flour mixture to the wet mixture and mix until cookie dough has formed. Be sure to scrape the sides of the bowl and be sure not to over-mix.
Use a regular ice cream scoop equivalent to 1/4 cup to scoop the dough and place on the prepared baking sheet. Lightly press the dough balls down a bit with the bottom of a glass or your fingers. Bake for 12-14 minutes or until the middles aren't super soft (but they will be soft) and the tops won't turn a golden brown
Wait a few minutes and then transfer the baked cookies onto a cooling rack and cool completely.