Preheat your oven to 350°F (175°C).

In a large mixing bowl, cream together the peanut butter, brown sugar, egg, salt, and vanilla extract using an electric mixer.

Add the all-purpose flour and mix on low speed until a sticky dough forms.

Fold in the semi-sweet chocolate chips using a rubber spatula.

Roll the dough into 1-inch balls and place them on a parchment-lined baking sheet, spacing them 2 inches apart.

Flatten each cookie dough ball with a fork to create a crisscross pattern.

Bake for 7-8 minutes or until the edges are slightly browned, then cool on the pan for 5 minutes before transferring to wire racks.