Preheat a gas or charcoal grill to medium heat and line a sheet pan with aluminum foil.
Spread 15 graham crackers with chocolate spread and line them up on the prepared sheet pan. These will be the sandwich bases.
Using 2 spoons, dollop the marshmallow cream evenly on the chocolate-spread graham crackers. Sprinkle the mini marshmallows evenly across the graham crackers. Do the same with the caramel chips, chocolate chips and toffee bits. Top each bottom cracker with a top cracker to create a sandwich.
Place the sheet pan on the grill. If your grill has a lid, close it. If your grill does not have a lid, flip a second sheet pan over and rest on top of the pan of s'mores to create a lid. Cook until everything is deliciously melted, about 25 minutes. Serve warm.