Line baking pan with parchment paper. Dust paper with powdered sugar.
Pour ½ cup water & gelatin mix into large bowl. Let this sit while you create the syrup.
In saucepan, over medium-high heat, pour in sugar, corn syrup, & remaining water. Stir until the mixture begins to boil.
Cover the mixture for 2 minutes & then remove lid. Let mixture boil for another 5-10 minutes, watching it very closely so it does not burn.
Once syrup is complete, pour mixture into bowl of water & gelatin.
With an electric handheld mixer, begin mixing the ingredients at a low-medium speed for one minute.
Increase speed to medium-high & continue mixing about 10-15 minutes, until thick & stiff.
Pour mixture into lined baking sheet & let it sit, uncovered, at room temperature for 12 hours.
Place marshmallows into the freezer for 4 hours.
Remove & cut with knife. Enjoy!