This tutorial is a bit of a clever one! The maker uses a silicone muffin cup to make the base. There’s a little awkward phrasing about what to use as the “prop” for the icing to sit on during baking but I would wad paper, polyfill or foil up, myself although if you have the perfect metal shape, go for it..
Also? Clay candy sprinkle tip: Extrude some strands in candy colours, bake the strands then chop while warm. Voila, sprinkles for your clay cupcake decorating needs.