In a large mixing bowl, combine the crab meat, cracker crumbs, diced peppers, onions, mayonnaise, chopped parsley, Worcestershire sauce, Dijon mustard, Old Bay seasoning, salt, black pepper, and the beaten egg. Using a spatula, gently fold the ingredients together until they are fully incorporated, being careful not to break up the crab meat too much. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, allowing the mixture to firm up and the flavors to meld. For deeper flavor development, the mixture can be refrigerated overnight.