Crush the graham crackers, you can do this with a rolling pin over a freezer ziploc bag or in a food processor for smoother texture (my favorite)
Mix it with the powdered sugar
Pour in the melted butter and mix until it's crumbly.
Add the peanut butter and mix until combined
Press into a 9x13 pan
Melt the chocolate and pour over the peanut butter, smooth it out as best you can.
Let the chocolate set then cut and enjoy!