I’ve never done one but have thought of it several times. Depending on the size you want it, you could stack 6" rounds or cut out smaller circles with a round cookie cutter and stack. Then just carve our (can use a slightly smaller round cookie cutter for the shape) the top. Maybe use chocolate frosting for the coffee or brown piping gel would have a more realistic look. You could make steam out of RI or white chocolate or candy melts for a cartoonish look. I’m thinking I would use gum paste for the handle (made several days before) and attach with skewers post delivery. Another thought on the handle for a larger than life mug is to make it out of rice cereal treats and cover it in modeling chocolate. I believe this would be lighter. Don’t know if that helps any, especially since I’ve only done it in my head. :)
