Drain pineapple, reserving 1/3 cup juice (discard or save remaining juice for another use). Line a 9-in. round baking pan with waxed paper; coat with cooking spray. Spread pineapple over waxed paper; sprinkle with gelatin. , In a large bowl, beat egg substitute and egg white. Beat in the sugar, reserved pineapple juice and vanilla. Combine flour and baking powder; add to egg mixture and mix well. Pour over gelatin. , Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool for 5 minutes; invert onto a serving plate. Serve warm.