Preheat oven to 350ºF (177ºC). Line a baking sheet with parchment paper.
In a medium bowl, mix together the peanut butter, sugar, and egg until smooth. Stir in the chocolate chips.
Shape the dough into balls, containing about a tablespoon of dough each, and place on the prepared baking sheet. Push the top of the dough to flatten just slightly.
Bake for about 10 minutes or until edges are lightly browned, but centers are still soft.
Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to finish cooling.
Notes
Cookies will stay fresh in an airtight container at room temperature for up to 1 week or in the freezer for up to 3 months.