Line a 9x9 or 8x8 baking dish with parchment paper.
In a large bowl, mix Graham cracker crumbs, butter, and 1 cup peanut butter together.
Add vanilla extract and confectioner's sugar. Mix until combined.
Press the mixture to one even layer in your prepared pan.
Melt remaining peanut butter and chocolate chips until smooth. Pour over the peanut butter mixture.
Chill in the refrigerator for 2 hours. Remove from the refrigerator 10 minutes before serving.
Sprinkle sea salt over the bars, optional.
Serve and enjoy.