Preheat the oven to 350°F. Grease and line a metal 9×13 pan with parchment paper.
In the bowl of a stand mixer, combine the melted butter, brown sugar, and granulated sugar. Mix until combined. Add in the vanilla and eggs, and mix until incorporated.
While the mixer is on low, add in the flour, corn starch, baking soda, and salt. Mix until just combined. Fold in the chocolate chips.
Scoop half of the batter into the prepared pan and spread it evenly to the edges. This layer will be thin.
Pour the caramel on top of the cookie dough, leaving about ½ inch around the edges uncovered. Refrigerate for 15 minutes to set the caramel.
Top with the remaining cookie dough, spreading it out evenly. It's okay if some caramel peeks through.
Bake for 25-30 minutes, or until the edges are golden brown. Remove from the oven and allow to cool completely before serving. For the best results, refrigerate the bars before slicing.