For Marshmallows:

• Prepare a 12x8 baking dish (do not use a metal pan) by sprinkling it generously with powdered sugar. Set aside.
• In the bowl of a stand mixer fitted with the whisk attachment combine the gelatin and ½ cup of cold water. Allow the mixture to sit.
• In a large saucepan combine the sugar, corn syrup, and ½ cup water. Place over medium-high heat. Allow the sugar to dissolve and raise heat to high. Cook until the mixture reaches 240 degrees (F). Remove from heat.
• Turn the mixer to low speed and slowly pour the sugar mixture down the side of the bowl into the gelatin.
• Turn the mixer on high and allow to mix for about 15 minutes or until the mixture is very thick. Add the vanilla and combine.
• Pour the mixture into the prepared pan, spread evenly, and dust the top with more powdered sugar.
• Allow the mixture to sit overnight uncovered to allow the marshmallows to dry out.
• Remove marshmallows from pan and cut into desired shapes.