Step 1

Add butter to a large microwave-safe mixing bowl. Heat in the microwave until the butter is completely melted. Stir in the peanut butter. Once combined add the graham cracker crumbs and powdered sugar. Stir until everything is completely incorporated.

Step 2

Pour mixture into a 9x13 baking pan and spread evenly. Place in the refrigerator while you prepare the ganache topping.

Step 3

Heat the chocolate chips and remaining 1/2 cup peanut butter in a microwave safe bowl. Heat 30 seconds at a time and stir between intervals.

Step 4

Pour the ganache over the peanut butter layer. Smooth into an even layer.

Step 5

Refrigerate 1-2 hours. Cut and serve. Store bars in the refrigerator.