Preheat oven to 180 degrees Celcius.
Mix the peanut butter and sugar for one minute, or until creamed, then mix the vanilla essence through.
Add the dry ingredients (flour, salt, baking soda) and combine until a crumb-like mixture forms.
Add the milk and chocolate chips and mix until combined.
Grease a baking tray or line one with baking paper.
Roll dough into balls.
Flatten gently on the baking tray/paper with a fork.
Bake for 8–10 minutes or until crispy.