Preheat oven to 350℉ (180℃)
Lightly grease baking pan with butter or baking spray.
Place granulated sugar, brown sugar and melted butter in a large bowl. Whisk until smooth.
¾ Cup Granulated Sugar, ½ Cup Brown Sugar, ¾ Cup Unsalted Butter
Add the egg and egg yolk to the bowl. Whisk until smooth.
1 Large Egg, 1 Large Egg Yolk
Add flour and salt to the bowl and mix with a rubber spatula until moistened.
1 ½ Cup All-purpose flour, ½ Teaspoon Salt
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 evenly over the top of the cookie dough.
20 Small Caramel Squares
Add the remaining cookie dough to the pan over the caramel. Smooth with an offset spatula.
Sprinkle ½ cup of chocolate chips evenly 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.