Line a 9x9 pan with nonstick foil.

In a mixer, beat peanut butter, butter, salt, and powdered sugar until smooth.

Microwave chocolate and shortening together until melted.

Lay half the graham crackers on the bottom of the pan in a single layer.

Spread on 1/3 of the melted chocolate.

In your hands, flatten the peanut butter filling and lay over the chocolate as smoothly as possible.

Layer on another 1/3 of the chocolate.

Add another layer of graham crackers.

Spread on the rest of the chocolate and chill for an hour.

Cut into bars and store in the fridge.