In a large pot over high heat, steam mussels in beer and cream, stirring frequently to ensure even cooking. When mussels have all opened, remove from heat and drain, reserving cooking liquid in a bowl. Strain cooking liquid through a fine sieve, place in a pan and boil until reduced to one-third.
Once mussels are cool, break in half and discard the empty sides. Arrange the mussels on an oven-proof platter.
In a large frying pan over high heat, melt butter and sauté shallots, smoked bacon and mushrooms until bacon is cooked and vegetables are soft. Spoon mixture evenly over mussels until well covered and drizzle with reduced mussel broth. Top with parsley and cheese and heat in oven or a closed barbeque until cheese is melted and mussels are bubbling.
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