In a food processor, place graham crackers and process on high until it becomes like bread crumbs. You do not want any large chunks of graham crackers.
To food processor, add peanut butter, powdered sugar, and melted butter. Process until fully combined and one smooth mixture.
Press peanut butter mixture into a 9 by 9 pan. Using a rubber spatula or waxed paper works best to press it into the corners. Place the entire pan in the freezer for at least 10 minutes or until the peanut butter mixture has set.
While the peanut butter mixture is chilling, place chocolate chips in a microwave proof bowl. Microwave for 30 seconds. Stir and microwave for an additional 10 seconds. Repeat the process until the chocolate is completely melted and no lumps remain.
Remove the pan from the freezer and pour the melted chocolate over the top. Return to the freezer for about 10 minutes until the chocolate has cooled.
Remove from freezer and cut into squares to serve. Keep refrigerated.
Cut into squares and keep refrigerated or place in freezer to store long term. Allow to sit after removing from being chilled. Chocolate will be very hard if you try to eat it when frozen. Placing the squares in between sheets of waxed paper makes it easier to eat and allows the pieces to thaw sooner.If you do not want to cut into squares, give the pan time to warm up before trying to cut as the chocolate will crack if you try to cut it straight from the fridge.