Chocolate "gold coins", found in most supermarkets
"Coin" candy molds
Melt the melting chocolate and carefully pour into the coin molds.
Once set up remove the coins, taking care not to break them, and cover them in the aluminum foil.
Add them to a Paper-Mache Cauldron along with the gold coins and set them on a table for everyone to enjoy!
hardhat_cat's tutorial was taken with permission from the Harry Potter Crafts Yahoo! Group.