Preheat the oven to 350°F (176°C). Line a large baking sheet with parchment paper; set aside.
In a stand mixer, mix the peanut butter, sugars, egg and baking soda on medium speed until combined. Fold in the chocolate with a spatula.
Create 1-inch (2.5cm)balls and place on the baking sheet at least 2 inches (5cm) apart.
Bake for 12 minutes or until lightly golden. Remove from the oven and allow to rest on the baking sheet for approximately 5 minutes, before transferring to a rack to cool completely.
Notes
Because the dough has so much chocolate, try pressing the dough together to form the balls rather than rolling. It works better.