Preheat oven to 350F degrees. Spray a 9x13-inch baking dish with nonstick cooking spray.

Mix together 1 1/2 cups salted butter, softened to room temperature and 1 1/2 cups sugar using an electric mixer (or stand mixer) until fluffy.

Mix in 2 large eggs and 1 Tablespoon vanilla extract. Then stir in 1 teaspoon baking soda and 1 teaspoon cream of tartar.

Slowly mix in 4 cups all-purpose flour (a little at a time) just until the mixture is combined and you don't see anymore white bits (don't over mix)

Finally, stir in 2 cups chocolate chips by hand. Batter will be very stiff so this will take a couple of minutes.

In a bowl, whisk together 11 ounce jar caramel sauce and 1/4 cup all-purpose flour until totally combined.

Press half of the cookie bar batter into the bottom of the prepared baking dish and halfway up the sides. This is easiest if you spray a little nonstick spray onto your hands and then press the batter gently.

Pour caramel sauce on top of batter.

Drop spoonfuls of the remaining dough evenly over the top of the caramel.

Bake for about 25-35 minutes until golden brown.

Cool completely before cutting.