Preheat oven to 350F. With knife blade in processor bowl, churn peanuts to a chunky peanut butter stage, about 2 minutes. Add brown sugar, shortening, baking soda, egg, vanilla and salt. Process to mix, about 20-30 secs. Add flour: pules just until mixed, 8-10 times.

If flour is not completely mixed in, remove knife blade and mix by hand. Shape dough into 1″ balls. Place on ungreased cookie sheets, and flatten balls with a fork in a criss-cross pattern to 1/4″ thick. Bake until golden brown, 10-12 mins. Makes 40+ 2″ cookies.