Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan or line it with parchment paper for easy removal.
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until the mixture is light and fluffy.
Add in the eggs one at a time, beating well after each addition. Then stir in the vanilla extract until combined.
In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add this dry mixture to the wet mixture, mixing until just combined.
Fold in the chocolate chips and chopped nuts, ensuring they are evenly distributed throughout the dough.
Spread half of the cookie dough evenly in the prepared baking pan. Use a spatula or your hands to press it down firmly.
Drizzle the caramel sauce over the first layer of cookie dough, spreading it out as evenly as possible.
Take the reserved half of the cookie dough and crumble it over the caramel layer, ensuring there are gaps for the caramel to peek through.
Bake in the preheated oven for about 25-30 minutes, or until the top is golden brown and a toothpick inserted comes out mostly clean (a little gooey is okay!).
Allow the bars to cool in the pan for at least 15 minutes before cutting them into squares. They will be easier to slice when slightly cooled but still warm.
Notes
Serve the bars warm or at room temperature, drizzled with additional caramel sauce and garnished with a sprinkle of sea salt for an extra touch.