Chop up the mushroom or put in food processor using the chopping blade until finely chopped.
In a bowl: Combine the chopped mushroom, the crushed vegan crackers or cooked rice, the chopped onion, egg substitute and salt and pepper to taste. Mix till combined.
Heat about 1/4 inch of corn oil in a pan. Form the mushroom mixture into patties. Place in pan. Fry till lightly golden. Turn and fry other side the same.
Serve on a bun with all your favorite trimmings or top with gravy and serve with mashed potatoes and your favorite vegetable.