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Preheat the oven to 350°F
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Remove stems from the mushrooms.
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Wipe the caps clean.
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Arrange the caps, upside down, in single layer in a baking dish, preferably glass.
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Rinse and finely chop the stems.
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In a mixing bowl, combine chopped stems with crab, onions, cream cheese, mayonnaise, and Tabasco.
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Add a little celery or garlic if desired.
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Salt to taste.
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Fill each mushroom cap with some of the mixture.
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Add enough water to cover the bottom of the baking dish.
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Sprinkle each cap with Parmesan cheese.
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Bake for 15 to 20 minutes, or until they are hot through and the cheese has browned.