Place granulated sugar, brown sugar and melted butter in a large bowl. Whisk until smooth.
Add the egg and egg yolk to the bowl and whisk until smooth.
Add the flour and salt to the bowl and mix with a rubber spatula until moistened.
Stir in ½ cup of the chocolate chips.
Lightly press ⅔ of the cookie dough into a 10" round tart pan with a removeable bottom. Alternatively, lightly butter a 9" square cake pan and press in ⅔ of the dough.
Sprinkle caramel pieces over the top of the cookie dough.
Add the remaining cookie dough to the pan over the caramel. Smooth with an offset spatula. Sprinkle ½ cup of chocolate chips over the top layer of cookie dough.
Bake for 30 minutes (top will be a golden brown color and a toothpick inserted in the center will come out clean). Place pan on a baking rack and allow to cool for at least one hour before cutting.