I'll give you my simplified directions here - their directions are much more descriptive than mine.
1 tbsp confectioners sugar
1 tbsp cornstarch
canola oil for oiling the pan and knife
1 packet gelatin powder
2-3 drops red food coloring (optional)
2 egg whites
2 cups granulated sugar
1 cup water
-sift sugar and cornstarch together into a small bowl. Rub an 8 inch square pan with a little of the oil, then sprindle some of the sugar mix on top to dust the pan - set both the bowl and pan aside
-bring a kettle of water to almost a boil. Mix 1/2 cup of water with the gelatin powder and stir until gelatin is disolved. Add a couple of drops red food coloring to the mix if desired.
-Put egg whites into a stand mixer near the stove
-Put the granulated sugar and water into a medium saucepan. Put it over low heat and mix until all the sugar granules are dissolved. Clip a warmed candy thermometer to the pan and raise the heat to boil the sugar and water together. While this mixture is heating, start mixing the egg whites until stiff peaks form.
-Boil the sugar until it reaches 252* (hardball stage) and immediately turn off the stove
-Pour the gelatin into the pan of syrup and mix with a wooden spoon.
-Turn the mixer back on low and very carefully add the syrup to the egg whites.
-Mix everything together (you can raise the speed a bit here) and keep mixing until everything is thick and bulky but still pourable (if you lift up the beaters a ribbon of marshmallow should sit on the surface for a few seconds before sinking back down).
-Pour the marshmallow into a prepared pan and let set in a cooled place for an hour or two.
-Dust the cutting board with the rest of the cornstarch mixture. Coat a putter knife with a little oil. Ease the marshmallow onto the board. Sift extra cornstarch/sugar mix on if neccessary. Cut the marshmallows into squares (you probably need to oil the knife after each cut)
My kids were very impressed with this recipe and everyone had a chance to pitch in. Great family project :)