Preheat oven to 350 degrees F. Spray the cookie sheets with Pam. In a large bowl with an electric mixer on medium speed, beat together peanut butter, brown sugar, butter, sugar and eggs. Mix until creamy. Stir in vanilla.
In another bowl, sift together flour, baking soda, and salt. Stir into butter mixture until blended. Add chocolate chips and stir until evenly mixed in.
Drop by rounded teaspoons onto cookie sheets. Flatten each cookie with a fork.