Spray a 9x9 baking dish with cooking spray.
In a medium bowl add graham cracker crumbs, sugar, peanut butter and melted butter. Mix until combined.
Spread peanut butter mixture into dish and gently press.
In a small bowl add chocolate chips and heat in the microwave for 1 minute and stir. Melt another 30 seconds if needed. Add in 1/4 cup peanut butter and mix until combined.
Pour chocolate over peanut butter mixture and spread evenly.
Refrigerate 2 hours or until firm.
Remove from refrigerator and sprinkle sea salt over the top.
Cut into squares and serve.