Gather sugar skull molds, granulated sugar, meringue powder, water, mixing bowl, spoon, and cardboard or tray
Mix sugar with meringue powder in a bowl
Add a small amount of water gradually
Stir until the mixture feels like damp sand and holds its shape when pressed
Pack the mixture firmly into the skull molds
Level the backs with a straight edge or spatula
Unmold the skulls onto a flat surface
Let the skulls dry completely for several hours or overnight
Prepare royal icing with powdered sugar, meringue powder, and water
Pipe royal icing onto the dried skulls for decoration
Add colored icing, sprinkles, foil, or candies as desired
Let the decorations dry before handling
Store the finished sugar skulls in a dry place