Milk chocolate is traditional. And most people use a flat Hershey bar when they make s'mores over a campfire. Elevate your game with candy bars like a peanut butter cup. Or melt your favorite chocolate (50% power in a microwave) and spread it on a sheet of wax paper. When it cools, cut it into squares or break off random pieces and stack them in a small dish on the charcuterie tray.