Started making this myself a few months ago, too. However, I don't use any vanilla extract or salt (don't we have enough salt in our food as it is?!). Like some others I have varied it up a bit by making the semi-sweet part first and then, while still hot, adding white chocolate to the top and swirling it in. Looks even more delish that way. Also a great ingredient to add: Smashed up Skor bar interior from local bulk food store. Like choc chips but made of toffee; added AFTER melting but before pouring the other choc chips.