Clean the mussels under running cold water, pull off the beards, knock off the barnacles with the back of a knife, if they don't close when tapped, discard.
Saute the bacon, shallots & garlic gently in the butter
When soft, turn up the heat add the mussels, thyme, bay leaves & wine then cover
After 4 or 5 minutes the mussels should be fully open, add the cream & parmesan bring to the boil, take off the heat, add the parsley, check the seasoning, it may need a little pepper, then serve immediately