Take an 8 x 8 baking dish and line it with plastic wrap. Sprinkle a generous layer of powdered sugar on the plastic wrap. Combine 1/2 cup of the cold water, mint extract and food coloring in a big bowl and stir it all together. Then pour the granulated gelatin into the mixture and stir it all again well so that the gelatin is thoroughly mixed in. Set it aside to let it turn into a soft, green gelatin.

Meanwhile, get a small pot on the stove filled halfway with water and bring it to a simmer over medium heat. While the water heats up, combine the egg whites, sugar, corn syrup and remaining 1/4 cup of water in a large, heat proof bowl. Set the bowl over the simmering water and beat it together with a hand mixer to lightly cook the eggs and dissolve the sugar for about a minute. Then add the gelatin mixture in and keep mixing it with the hand mixer for another 2-3 minutes over the heat.

Take the bowl off of the heat and continue to mix it all on medium speed for about 10-15 minutes, until it has doubled in volume and becomes thick enough to be slightly stiff. Pour the mixture into the prepared pan and sprinkle it with another generous layer of powdered sugar on top. Let it sit on a shelf in the freezer for 3-4 hours to completely set. Then turn it out onto a clean cutting board dusted with more powdered sugar and peel the plastic wrap off of the bottom. Cut them into roughly 1 inch cubes and serve with s'mores, in crispy treats, you name it!