Preheat your oven to 335F
Gather all your ingredients, measure everything then set aside.
Place parchment paper on top of two cookie sheets for baking and set aside.
In a mixing bowl add in your dry ingredients, flour baking soda, baking powder, salt, brown sugar and granulated sugar.
Use a whisk and mix everything together, getting rid of any lumps.
In a separate small bowl, crack one egg and mix before adding the mixed egg to your main mixing bowl.
Add melted butter, milk, vanilla extract, chocolate chips and peanut butter to the mixing bowl and mix the entire batter using a handheld mixer.
Using an ice cream scoop, scoop a small amount of dough and place them on your cookie sheets about 2" apart.
Place one cookie sheet on the top rack and the other on the bottom of the rack and bake for about five-six minutes before placing the top rack cookies on the bottom rack and the bottom rack cookie to the top rack, bake for another five to six minutes.
Take the cookies out of the oven and allow the peanut butter chocolate chip cookies to bake for another five minutes on the baking sheet before moving them to a cooling rack to fully cool.