A personal favorite! This is very close to the appetizer served at John Shields' restaurant at the Baltimore Museum of Art called "Gertrude's," which started me on this chase. Some people say everything is better with bacon; I say everything is better with dry sherry! At Gertrude's, John Shields further reduces the butter/sherry liquid to create a thick pool on the plate on which to place the stuffed mushrooms; if you prefer to do that, use 4 tablespoons butter to saute the bell peppers and chopped mushrooms. And if the only crabmeat you can get is the pasteurized canned crabmeat, this recipe gives you your best shot at making it taste GOOD. From "Chesapeake Bay Cooking with John Shields". Note: In Maryland, crab-stuffed mushrooms can resemble a crab cake sitting atop a mushroom cap "plate"; do not picture a mushroom cap with scant filling, that's not our style. You do not want the taste of the portabello mushrooms to overwhelm the crab.