I made cupcakes 2 days ago, and there are enough left over that I want to serve them for dessert tonight. They still taste great, but the homemade chocolate frosting has formed that hard layer/crust on top. Clearly I failed to put them in an air-tight container immediately, but failure aside... what's the best way to refresh the icing so that they give off that just-baked appearance? And adding a fresh layer on top is not an option, as there's no more icing left.
Thanks in advance for all your wisdom!