To coat the truffles, work one at a time and place each in the bowl of melted chocolate. Use a fork to gently lift the truffle out of the chocolate - don't pierce it, just scoop it out with the forks tines. Tap the fork gently against the edge of the bowl to let any excess chocolate drip off, then gently drop the truffle into a parchment lined baking tray. If topping with sprinkles, then sprinkle them on immediately after dropping the truffle into the tray, before the chocolate starts to set.