Personally, I like to take my leftover chocolates (or chocolate bars, if I've already used up all my leftovers for other fun recipes), and chop them into chunks. You don't need to worry about all the pieces being identical in shape or size! If you're not a fan of biting into hard chocolate, though, you can also melt down your chocolate and add in a little bit of water before waiting for it to harden a little and chopping it up. Adding the water can help make each of the chocolate pieces a little softer and skinnier.