3 packets unflavored gelatin
1/2 cup cold water
2 cups granulated sugar
1 cup light corn syrup
1/2 cup water
1/4 teaspoon salt
1 tablespoon vanilla extract
Powdered sugar for dusting
Grease an 8×8-inch pan
Combine gelatin and cold water in a mixing bowl
Let the gelatin bloom
Combine sugar, corn syrup, water, and salt in a saucepan
Heat the mixture until it reaches 240°F
Remove the syrup from heat
Start mixing the bloomed gelatin on low speed
Slowly pour the hot syrup into the gelatin while mixing
Increase mixer speed to high
Whip until thick, white, and fluffy
Add vanilla extract
Mix until fully combined
Pour the mixture into the prepared pan
Smooth the top with a greased spatula
Dust the top with powdered sugar
Let the marshmallows set for at least 4 hours
Turn out onto a powdered sugar-coated surface
Cut into squares
Toss the cut marshmallows in powdered sugar