Preheat oven 375 degrees F and grease cookie sheet, use parchment paper or silpat.

In a large bowl add butter, brown and white sugars and cream until fluffy.

Add egg, peanut butter, milk, vanilla extract, and mix. Then add baking soda, salt, all purpose flour and mix.

Roll into large ball about 2 inches and press in the center of the cookie Ghirardelli dark salted caramel bar. Press with a fork to flatten the cookie.

Bake for 14-16 minutes or until golden brown.