Dust a work surface with confectioners’ sugar. Roll a piece of marzipan to 1/16 in/0.15 cm thick using a small rolling pin.
Using a cutter or a template and sharp paring knife, cut a circle, oval, or other desired shape out of the marzipan.
Lay the plaque on a flat surface and, using your fingers and the palm of your hand, buff and smooth the cut edges and the top surface of the plaque, being careful not to crack or break the marzipan.
Place the plaque on a parchment-lined sheet pan and allow to dry at room temperature until it is completely hard. Use an emery board or very fine sandpaper to smooth any rough edges. Pipe lettering on the plaque or decorate as desired.