Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking dish.
In a bowl, combine graham cracker crumbs, granulated sugar, and melted butter.
Press the crumb mixture firmly into the bottom of the prepared baking dish.
In a separate bowl, mix creamy peanut butter and powdered sugar until smooth.
Spread the peanut butter mixture over the crust evenly.
In a saucepan, melt the chocolate chips with coconut oil over low heat, stirring constantly until smooth.
Pour the melted chocolate over the peanut butter layer and spread evenly.
Chill the bars in the refrigerator for at least 2 hours before slicing.
Once set, slice the bars into squares and serve.
