3 packages unflavored gelatin
1 1/2 cups granulated sugar
1 cup light corn syrup
1/4 teaspoon kosher salt
1 tablespoon pure vanilla extract
Confectioners’ sugar, for dusting
Combine the gelatin and 1/2 cup of cold water in the bowl of an electric mixer fitted with the whisk attachment and allow to sit while you make the syrup.
Pour the marshmallow batter in an 9 by 13- pyrex that has been greased and dusted generously with confectioners sugar. Smooth the top of the mixture with damp hands. Dust on more powdered sugar and let sit overnight before cutting. As you cut them, sprinkle more powdered sugar on the edges as they will be sticky.