Step 1

Line a 9 x 9 inch baking pan with parchment paper; set aside.

Step 2

In a bowl, use an electric mixer to combine the peanut butter and melted butter. Add in the powdered sugar and mix until just combined. Press the dough into the prepared pan using a rubber spatula or damp hands. Refrigerate for 20 minutes.

Step 3

For the chocolate topping, melt the chocolate chips and 1 tablespoon of butter in a microwave safe bowl at 50% power, stopping to stir every 30 seconds, until just melted. Spread over cooled bars. Refrigerate until hardened and cut into small squares.