Prepare a 9x9 baking dish by lining it with plastic wrap. Lightly grease the plastic wrap and top with another layer of plastic wrap. Set aside.

Fit an electric mixer with the whisk attachment.

Pour half the water and gelatin into a bowl and set aside.

In a sauce pan, combine the rest of the water, corn syrup, and granulated sugar. Boil on high for 5 minutes.

Pour the boiling mixture into the bowl with the gelatin and water and beat on high for 12 minutes. The mixture should turn white and fluffy and look like marshmallow fluff.

Once the mixture is white and fluffy, pour in the vanilla extract and strawberry jam. Mix to combine.

Remove the second layer of plastic wrap from the 9x9 baking dish. Pour the marshmallow fluff into the prepared baking dish. Top with the second layer of plastic wrap.

Let the marshmallows sit for at least 5 hours or overnight at room temperature.

Mix the cornstarch and powdered sugar together and sprinkle on baking sheet.

Once the marshmallows have set and are not sticky, lift them out of the pan and cut into even cubes. Roll around in the corn starch and powdered sugar mixture. Dusk off the excess powder and they are ready to go.

Enjoy!