Sprinkle 1/2 cup cold water with gelatine in big bowl, set to the side.
Let Bloom for 5-10 minutes. In pan combine sugar, corn syrup and 1/4 cup water. Boil one minute.
Pour sugar mixture into gelatine. Mix very hard for 12-15 minutes
Add salt and vanilla. Scrape into an oiled long shallow, cookie pan with edges.
Let set up for a few hours, until very firm to the touch.
Then you take the huge loaf of marshmallow out and cut it into squares.
Size is up to you. Small or big, cut out into the shape of Christmas trees or stars using cookie cutters. After you cut them up you need to roll them in the powered sugar so they dont stick to everything.