Vegan Chocolate Ganache
You can use full-fat coconut milk instead of soy, if you prefer.
Semisweet chocolate chips are technically non-dairy, but most manufacturers include milk or milk derivatives for extra creaminess. Your local health food store will most likely carry a nondairy version. However, the national brand Guittard(R) or Trader Joe's(R) semisweet are cheaper and have the best flavor and consistency in my opinion.
For flavor variations, try adding several drops of extracts like peppermint, hazelnut, or almond.
Use warm to drizzle over cake or dip cupcakes in the ganache. Allow to cool and set up at least a 1/2 hour before serving. Or refrigerate several hours and beat with electric mixer for a more fluffy, spreadable frosting. The more powdered sugar you add (up to 1 cup), the stiffer the frosting will be.