I didn't put a recipe here because it doesn't really matter what you want to put the amulet on, as long as there's sufficient flat space. If you're looking for recommendations, I trust Dorie Greenspan
, Rose Levy Beranbaum
, and Deb Perelman
with my life. I made a heart-shaped vanilla buttermilk cake and covered it in fondant, gave it a cobblestone texture, and painted it up a bit. (Fondant isn't necessary for covering the whole cake though!) Make sure you have your cake or at least your cake pans so you know what scale to make your amulet. Also, the final assembly of the amulet is done on the cake, so fondant/buttercream needs time to set up before you do that.