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Dissolve the gelatin in ½ cup of water in the bowl of a stand mixer with the whisk attachment.
In a saucepan, combine the rest of the water, sugar, corn syrup, and salt and place over medium heat with the lid on. Cook for four minutes.
Uncover and cook for another eight minutes, until a thermometer reads 240 degrees. Remove from heat immediately!
Turn the mixer on low and slowly pour the sugar mixture into the gelatin. Turn heat to high and whip for another 12-15 minutes, until the mixture is light and fluffy. Add the vanilla and whip another minute.
While the mixer is whipping, combine the powdered sugar and corn starch. Spray a 9×13 baking dish and sprinkle it with the mixture.
Pour the mixture onto the baking dish, flattening out with a greased spatula. Sprinkle the top with the powdered sugar and allow to rest, uncovered, for at least four hours.
Transfer the marshmallow sheet to a cutting board and cut into even squares.