01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the brown sugar, baking soda, and salt until well blended.
03 - In a large bowl, mix the peanut butter, egg, and vanilla extract until smooth and completely combined.
04 - Add the dry ingredients to the wet mixture and stir until fully incorporated.
05 - Fold in the chocolate chips until evenly distributed throughout the dough.
06 - Scoop tablespoon-sized portions of dough onto the prepared baking sheets, spacing them about 2 inches apart.
07 - Gently flatten each dough ball using the back of a fork, making a crisscross pattern on top.
08 - Bake for 9-11 minutes, until the edges are set and lightly golden.
09 - Allow cookies to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.