Chop your chocolate fine to ensure fast, even melting, then stir it together with the corn syrup and coconut oil in a microwave-safe bowl. I nuke my chocolate in small doses—15 seconds on half power—stirring with a spoon in between. Three or four zaps should be enough to completely melt the chocolate. Don't have a microwave? A metal bowl set over a pot of simmering water works just as well.