In a small bowl, stir together the dry ingredients and set aside.
In the large bowl of a stand mixer, beat the butter and peanut butter until smooth. Add the milk, maple syrup, egg, and vanilla. Beat well to combine.
Add the dry ingredients to the wet ingredients and beat until incorporated.
Take a tablespoon of dough and roll it into a ball. Flatten the ball a little and place it on a cookie sheet. Continue with the remaining dough and bake for 8-9 minutes. Don’t let the cookies get brown or they will come out dry. Cool completely on a wire rack.
To make the chocolate swirl, melt the coconut oil and the chocolate chips (stovetop or microwave). Drizzle over the cooled peanut butter cookies and let the chocolate set.