You can use vegan semi-sweet chocolate chips or chop up a dark chocolate bar (around 70% cocoa) if you can’t find chips. I get my dairy free chocolate chips from Trader Joe’s, Whole Foods, Costco (Kirkland brand), and sometimes, Amazon. Guittard and Enjoy Life are also good brands. For vegan white chocolate, I like King David white chocolate chips because they work the best in baking and taste just like white chocolate chips with dairy. However, pretty much any brand of vegan white chocolate (chips or a bar) should work just as well.