Preheat oven to 375 degrees Fahrenheit. Grease a 9 x 13 inch pan and set aside.

Combine flour, baking soda and salt in small bowl. Beat butter, sugar, brown sugar and vanilla in a large mixing bowl until creamy. Add eggs, one at a time, beating well after each addition. Gradually mix in flour mixture. Fold in chocolate chips.

Spread half of cookie dough mixture into the prepared pan.

Place in preheated oven at 375 degrees Fahrenheit and bake for 8-10 minutes. Remove from oven.

While the cookie dough is baking melt caramels and evaporated milk in a double boiler. Add peanut butter after caramels are melted. Melt thoroughly. Spread over baked cookie dough base.

With the remaining cookie dough, drop by spoonfuls on top of the caramel mixture.

Place pan back in the oven at 375 degrees Fahrenheit and bake for 15-20 minutes or until top is light golden brown. Remove from oven and let cool before serving.