Melt chocolate

I bought milk chocolate chips to dip blueberries in but couldn’t get them to melt properly in a double boiler. They became a gloppy mess that was too thick to put the blueberries in, even after an hour of cooking and even though I made sure the boiling water never touched the top part of the double boiler. What happened?

Chocolate chips are not good for coating sweets because they don’t contain enough cocoa butter. It’s the cocoa butter that lets chocolate liquefy when melted. Next time, use semi-sweet or bittersweet chocolate or, if you really prefer milk chocolate, choose a European brand chocolate bar, as they tend to contain more cocoa butter than American brands.