Mix together softened butter and nut butter until well combined. I used a hand beater to mix better, but you could also use a large food processor.
Beat graham cracker crumbs into the butter mix. Once combined, mix powdered sugar into the mix.
Grease an 8x8 inch baking dish. Line with parchment or wax paper.
Push the nut butter mix into the bottom of the pan and level the top. You can do this with your hands.
Microwave or heat chocolate and coconut oil over a double boiler. Mix to combine. Once the chocolate is melted pour over the nut butter mix in the baking dish. Level the chocolate as best as possible.
Refrigerate for at least 4 hours so the nut mix in the bar hardens. They are ready to serve!