In a mixer fixed with a whisk, combine the gelatin and water. Let sit. On the stove in a small saucepan over medium to high heat combine the sugar, corn syrup, water and salt. Using a candy thermometer heat mixture to 240 degrees. Remove from heat.

Start your mixer on low and slowly add the heated mixture to your dissolved gelatin. Add vanilla and then increase the speed to high. Mix for 10-15 minutes till fluffy.

Dust powdered sugar on your glass (non-metal) baking dish. I used 9 x 13. Pour marshmallow mixture into dish and let stand for 8 hours (overnight). Place a piece of wax paper on the counter along with dusted powdered sugar. Using a cookie cutter or knife cut marshmallows into any shape you desire.