Heat the butter in a saucepan.
Fry the mushrooms and onion, Keep stirring continually for 3 minutes
Add 1 cup of milk and mix full pack of knorr mushroom soup and stir well.
Cook for another 3-4 minutes. Remove from gas.
Add fresh cream, cheese & pepper to mix well and keep aside. Let it cool.
Spoon the mixture into each Vol au Vent case and replace the lids.
Serve warm or cold with garnishing.