Preheat the oven to 350 degrees.
Mix together the peanut butter, brown sugar, egg, and baking soda in a bowl until a dough forms.
Fold in the chocolate chips.
Drop the dough by teaspoons onto a baking sheet. Place the dough 2 inches apart.
Bake for 10 minutes.
Remove from oven and allow to cool for 5 minutes before removing from the cookie sheet to a baking rack to cool completely.