Place the gelatin along with half of the water, in a small dish and slightly stir. Do this quickly. Set aside.

Spray your pan with nonstick spray and coat it entirely with a mixture of powdered sugar and cornstarch.

Place the corn syrup, sugar, salt, and remaining water in a saucepan and heat over the stove on a medium setting. You want to reach 240 degrees and this will take between 10-15 minutes. This is the hard ball stage, which means if a drop of the liquid were placed in cold water, it would ball up and sink to the bottom.

Immediately transfer the liquid into a medium mixing bowl, along with the gelatin mixture and a bit of the neon green gel dye. Use the hand mixer to beat the mixture until thick, like milky, melted marshmallows. This will take about 5-7 minutes.

Add in more dye as you go along to get the desired color.

Pour the marshmallow mixture into the prepared pan and spread even. Tap on the counter to level.

Leave the mixture to set in a cool, dry area for at least 4 hours or until solidified like a marshmallow.

Turn out the marshmallows onto a flat surface covered in a mixture of powdered sugar and cornstarch. Cover the entire square with the mixture as well.

Cut into ½-inch squares or into larger squares, depending on your preference.

Top with a red heart sprinkle, if desired, and enjoy!