Place 4 of the crackers on a lined baking tray and top each with a peanut butter cup. Place under the grill and allow to heat to the point of melting. Top each with a marshmallow and return to the grill until it’s toasted and molten inside.
Spread a heaped teaspoon of salted caramel sauce on the remaining graham crackers and sprinkle with peanuts. Sandwich each of these with a peanut/marshmallow cracker. Squidge together and eat immediately.