Preheat oven to 350°F.\n\n1. In a medium bowl, beat together peanut butter, brown sugar, egg, and baking soda until the mixture is smooth and well-blended.\n2. Stir in chocolate chips until evenly distributed.\n3. Drop teaspoonfuls of slightly rounded dough onto **un**greased baking sheets. Space the mounds about 2 inches apart.\n\nBake about 10 minutes until the cookies are puffed and slightly golden, but still soft to the touch.\n\nLet them cool on the baking sheet for about 5 minutes before transferring to a wire rack to cool completely.