3 envelopes (2 ½ tablespoons) unflavored powdered gelatin
½ cup cold water, divided
1 ½ cups granulated sugar
1 cup light corn syrup
¼ teaspoon salt
2 teaspoons vanilla bean paste*
½ cup powdered sugar, for dusting
Directions
Spray an 8x8-inch baking pan with nonstick spray.
Sift about ¼ cup of powdered sugar through a mesh sieve into the pan. Shake or tap the pan to evenly distribute the sugar along the bottom and sides.
In a stand mixer with a whisk attachment, add ½ a cup of cold water and the gelatin. Allow the gelatin to bloom while you make the sugar syrup.
In a medium saucepan, add the granulated sugar, corn syrup, salt, and another ½ cup of water, stirring until combined.
Insert a candy thermometer into the saucepan and turn the stove heat to medium-high.
Heat, swirling every minute until the mixture reaches 240 F. Do not stir, instead just swirl the pan to move the mixture. It should take about 10 minutes to come to temperature.
Turn the mixer to a low speed, and while it's running, slowly pour the hot sugar syrup into the gelatin.
Once the gelatin has dissolved, add the vanilla bean paste. (If you are using a different flavoring, add it here)
Turn the mixer to high and let it whip for about 10 minutes. Once the mixture is fluffy and totally white, pour it into the prepared pan and spread it evenly. (Tip: Spray your spatula with nonstick spray.)
Let the marshmallows sit at room temperature for 4 hours, uncovered.
Sift ¼ cup of powdered sugar through the mesh sieve onto your work surface.
Loosen the edges of the marshmallows with a knife and carefully dump the marshmallow block from the pan onto the work surface.
Spray a sharp knife with nonstick spray and cut the marshmallows into cubes.
Coat the cut sides of the marshmallows in the powdered sugar.
Store the marshmallows in an airtight container at room temperature.