Beat the eggs until they are light in color with the dry sherry. Add the flour, baking powder, salt, white pepper, dry mustard and cayenne.
Scrape bowl to get all the flour mixed in with the eggs.
Gradually add the cream cheese beating until well after each addition. Beat in the Montrachet cheese. Add the shredded Monterey Jack cheese. Add the clean lobster meat, mixing slowly. Add the scallions, parsley and sliced mushrooms.