Remove mushroom stems and finely chop; set caps aside. In a large skillet, saute chopped mushrooms and onions in butter for 5-7 minutes or until tender. Remove from the heat. Stir in the crab, bread crumbs, blue cheese, parsley and salt. Spoon into mushroom caps.
Place on an ungreased baking sheet. Bake at 450° for 8-10 minutes or until heated through.
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