In a pinch, a teaspoon of vegetable shortening (like Crisco) will thin chocolate faster than a motivational speech. It’s not the healthiest, but who’s counting when you’re elbow-deep in melted chocolate? Definitely not you.
If you want to impress your friends, use cocoa butter wafers—they thin, add shine, and make your chocolate behave like a classically trained ballerina. Just melt them together, and boom: you’re a chocolatier.
How to Thin Chocolate: 6 Steps (with Pictures) - wikiHow
Butter works too, but it contains water, so use it sparingly. A tablespoon of butter per cup of chocolate is the max—beyond that, you’ll be making chocolate butter, which is actually amazing on toast, so that’s a happy accident.