Preheat oven to 375 degrees F and spray cookie sheets with cooking spray.

In a large bowl, using an electric mixer, cream the shortening, peanut butter and sugar.

Add the egg and milk and continue to mix.

In a separate bowl, combine the flour baking soda and salt. Gradually add this mixture to the creamed mixture and mix until well combined.

Roll dough out onto wax paper or a floured surface to form about a 12 inch by 10 inch rectangle. Then sprinkle the chocolate chips evenly on top.

Starting with one of the longer sides, roll the dough tightly to form a log. Wrap in plastic wrap and refrigerate for 20 to 30 minutes or until slightly firm.

Unwrap dough, cut into 1/2 inch slices and place about 1 inch apart on baking sheet. Bake for 10 to 12 minutes or until edges are slightly browned.