Preheat the oven to 375°F (190°C). Gather mixing bowls and a hand mixer.

In a medium bowl, cream together peanut butter, softened butter, granulated sugar, and brown sugar on medium speed for 2-3 minutes.

Add the egg, milk, and vanilla to the creamed mixture, mixing for another 2-3 minutes until smooth.

In a separate bowl, whisk flour, baking powder, and salt. Gradually add to the wet mixture until just combined.

Fold in the chocolate chips gently until evenly distributed in the dough.

Scoop tablespoon portions of dough and roll into balls, placing on a lined baking sheet.

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

Bake for 8-10 minutes or until slightly underbaked in the center. Remove and cool for 5 minutes.

Transfer cookies to a wire rack to cool completely.