Beat together the brownie mix, butter, cream cheese and egg with a hand held mixer until combined and fluffy.
Place tablespoons of the dough onto a baking sheet using a cookie scoop. Make an indentation with your thumb in the center of each cookie.
In a separate bowl, stir together the peanut butter and powdered sugar until well combined. Form this mixture into approximately 1 tsp size balls and gently press them into the indentations on the cookies and press them down slightly so that they are not raised higher than the cookie.
Bake for 10-12 minutes until the edges of the cookies are set and the cookies are crackly around the tops of the cookies.
Remove from the oven and let the cookies cool on the baking sheet for 5 minutes. Then move the cookies to wire racks to cool completely.
Then place the semi-sweet chocolate chips and oil of your choice in a microwave safe bowl. Heat in 20 second intervals, stirring after each interval until the chocolate is fully melted.
Spoon approximately 2 tsp of the melted chocolate on top of each cookie on the peanut butter portion of the cookie and let set so that the chocolate re-hardens.
Then the cookies are ready to enjoy!
Notes
Store any leftover cookies in an airtight container at room temperature for up to 1 week.