Beat together the unsalted butter, brown sugar and granulated sugar. Beat in the peanut butter.
Add the eggs and vanilla extract and beat until combined.
Add the flour and baking powder and beat until a dough forms. Fold in the chocolate chips and mini peanut butter cups until fully incorporated into the dough.
Press the dough into your skillet and bake for 24-26 minutes at 350 degrees Fahrenheit. Let cool slightly and enjoy!