If you don’t have superfine or powdered sugar, you can place granulated sugar in a blender or food processor and pulse it until it becomes a fine, powdery consistency.
Powdered milk is optional in this recipe but it helps add a nice creaminess to the hot chocolate-- and it’s available in most grocery stores.
I highly recommend using chocolate bark (also known as candy coating or almond bark) because it melts and rehardens easily and smoothly. If you don’t have chocolate bark, you can use tempered chocolate. Melted chocolate that has not been tempered is not recommended in this recipe.
I wear gloves when making the hot chocolate bombs so I don’t leave any fingerprints on the outside.