You can use anything as a mold if it’s made of plastic. Metal molds will work, but you will need to temper the chocolate, which shrinks the chocolate slightly when cooled so the bars will slip out of the metal molds.
It’s difficult to pinpoint exactly how much chocolate you’ll
need. But as an example, for the 4 bars I made, I used about 8 ounces (230g).
But the good news is that you can just melt what you think you might need, then
any leftover chocolate can be poured on a sheet of parchment paper or plastic
wrap and left to cool to be reused for another baking project.
1. Melt the chocolate in a clean, dry bowl set over a pan of
barely simmering water. If you want to temper the chocolate (see above.) While
the chocolate is melting, gather and prepare any ingredients you want to put on
the bars.
2. Once the chocolate is melted, (and tempered, if tempering the
chocolate), remove the bowl from the pan and wipe the moisture off the bottom
of the bowl.
3. Pour or spoon a layer of chocolate into your molds. Rap them
on the counter a few times to distribute the chocolate evenly and release any
air bubbles, then working quickly, top with any kinds of nuts, dried fruits, or
other ingredients that you wish and press them in slightly.
(You can also stir ingredients into the chocolate, such as
toasted nuts, seeds, crisped rice cereal, snipped marshmallows, or other ingredients, then
pour the mixture into the molds.)
4. Immediately put the bars in the refrigerator until firm. If
tempered chocolate is used, it shouldn’t take more than five minutes for them to
firm up. Otherwise the chocolate will take longer.
Tempered bars can be stored at room temperature for up to one
month; if using regular melted chocolate, store the bars the refrigerator until
ready to eat.