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Position a rack about 8 inches from the broiler, and heat broiler on High
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In a 12 inch skillet, heat oil over medium high heat
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Add the sausage and cook, breaking it apart
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Cook until golden brown in places, about 3 minutes
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Transfer sausage with slotted spoon to medium bowl
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Add mushrooms, onion, rosemary and 1/2 tsp salt to skillet
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Cover and cook, stirring once, until mushrooms are golden, about 5 minutes.
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Add beer and scrape up browned bits on bottom of pan
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Simmer until beer evaporates, about 1 minute.
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Toss with the sausage
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Meanwhile, toast the baguette on a sheet pan, cut side up, under the broiler until lightly golden and crisp, 1-2 minutes
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Spread the bread or roll with the mascarpone and season lightly with S & P.
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Top with the sausage mixture and then mozzarella.
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Broil until cheese melts, about 3 minutes
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Sprinkle with parsley, cool briefly and serve.