In a medium mixing bowl combine graham cracker crumbs, melted butter, ¾ cup of peanut butter and powdered sugar.
Mix with a mixing spoon until they are well combined.
Place this dough mixture into the prepared baking dish.
Spread the dough out to cover the bottom of the dish.
Press the dough firmly into the bottom to compress it.
In a small saucepan (you can absolutely use the same dish you melted butter in!) combine the chocolate chips and the remaining 2 tablespoons of peanut butter.
Allow this to melt over low heat. Be sure to stir often to avoid burning!
When the chocolate chips and peanut butter can be stirred and is melted completely and smooth, remove from heat and pour this mixture over the graham cracker mixture. Spread the chocolate layer on the top of the bars with a rubber spoon until it is uniformly spread.
Place the squares in the refrigerator for about 90 minutes to allow it to harden. Cut into small squares and enjoy.
Notes
These should be stored in an airtight container and hold up best when they are refrigerated.