I have served the batch that i had frozen, and make 2 new batches since then! I love this recipe. The frozen ones came out the best of all. I defrosted them for a few hours, but they were still chilled enough to keep their shape slightly better. I like to cook them for 9-10 minutes and leave to rest for around 5 minutes. My visitors loved them and most people had 2nd helpings!
If its for serving to company, i would hand chop the chocolate as it looks a bit better. Or use bought chocolate chips.