Preheat oven to 325°F (163°C). Line a 9x13 inch baking pan with parchment paper, leaving an overhang for easy removal.
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
In a large bowl, whisk the melted butter, brown sugar, and granulated sugar until smooth.
Add in the egg, egg yolk, and vanilla extract. Whisk until fully combined.
Gradually stir in the dry ingredients until just combined. Fold in the chocolate chips.
Spread half of the cookie dough into the prepared pan and smooth it into an even layer. Bake for 8-10 minutes.
While baking, melt the caramel bits and heavy cream together in a microwave-safe bowl in 30-second intervals until smooth.
Carefully spread the caramel over the baked cookie base. Sprinkle with ½ tsp sea salt.
Dollop spoonfuls of the remaining cookie dough on top of the caramel and gently spread to cover. It doesn’t need to be perfect.
Return to the oven and bake for another 20-22 minutes or until golden brown and set.
Cool completely before lifting out and slicing into bars. Sprinkle with extra sea salt if desired.