Heat oven to 350 degrees. In a medium bowl, beat the brownie mix, butter, cream cheese, and egg. The dough will be a little sticky. Scoop the dough onto an ungreased cookie sheet, making about 24 cookies. Smooth the edges of each to form a round cookie.

In a separate bowl, mix the powdered sugar and the peanut butter until it is completely combined. Form the mixture into about 1 inch balls. Make sure you have one ball for each cookie. Set aside.

Bake for the cookie dough 12 minutes, keeping an eye out to make sure the cookies doesn't overcook or undercook.

As soon as the cookies come out of the oven, press a peanut butter ball lightly into the center of each cookie. The peanut butter mixture will soften slightly, but that is OK. Let the cookies cool for 5 minutes, then transfer them to a wire rack to cool completely.