In a mixing bowl, beat egg substitute for 1 minute or until frothy and slightly thickened. Stir in milk and vanilla. Combine the flour, sugar, cocoa, baking powder and salt; add to the egg mixture and mix well.
Pour into a 13-in x 9-in x 2-in baking pan coated with nonstick cooking spray. Bake at 350 for 18-22 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.
Yield: 2 dozen