Get out your electric mixer and in the bowl of your electric mixer add in the cold water. Then sprinkle the gelatin on top.
Let it sit and soak for 10 minutes.
Grab a small sauce pan and combine sugar, corn syrup, and 1/4 cup water. Bring the mixture to a boil and let it boil for 1 minute.
Pour boiling syrup into the gelatin mixture in your electric mixer. Then start your mixer on high speed and carefully add in the salt.
Allow the mixture to beat for 12 minutes, then add in the vanilla and allow mixing to incorporate it in to the mixture.
Line your baking sheet with parchment paper. Then use your spatula spread a little bit of oil on to the parchment paper.
Rub your spatula again with oil and scrape the mixture onto the sheet pan lined with parchment paper and spread evenly.
Get another piece of parchment paper and spread oil on one side, then place the oil side down on top of the marshmallow mixture.
Let mixture sit for a 2-3 hours. You want the marshmallows to firm up.
Remove your homemade marshmallows from the pan.
Dredge the marshmallow slab with confectioners’ sugar. You only want a light coating of confectioners’ sugar on the top of them.
Cut into equal pieces with a pizza wheel.
Dredge each piece of marshmallow in powdered sugar again lightly.
Store in an air tight container or eat right away because they are so good you are going to want to!