Line an 8x8-inch pan with parchment, leaving an overhang for easy removal.

Stir graham crumbs, 1 cup peanut butter, melted butter, powdered sugar, and salt until a uniform, pressable dough forms.

Press mixture firmly into the prepared pan in an even layer.

Melt chocolate chips with 2 tbsp peanut butter in 20–30 second increments, stirring until smooth.

Pour chocolate over the crust and spread evenly with a spatula.

Chill at least 1 hour until firm, then lift from pan and cut into bars.