Oil a 9x13 baking pan and sprinkle powdered sugar on bottom to coat.
Pour ½ cup of cold water into electric mixer bowl. Add in packages of gelatin.
Use a whisk attachment and gently mix.
While that sits, add sugar, bourbon, syrup and salt to a medium pot. Heat on low and whisk until sugar dissolves.
Turn heat up to medium and allow sugar to come to a boil. Make sure it doesn’t overflow. Let it boil for 8-12 minutes until it reaches 240 degrees F. The mixture will look light brown but the end result will still be a white marshmallow.
Turn off the heat and add it to the electric mixer bowl with the gelatin inside, on a low speed setting.
Turn mixer to high and beat for 6-8 minutes.
About 3-4 minutes in, add egg whites to a separate bowl and beat until stiff peaks form.
Add egg whites and vanilla to electric mixer and mix until combined.
Pour mixture into 9x13 pan.
Dust powdered sugar on top and let set for 3-5 hours, until firm.
Once firm, turn pan upside down and cut into desired shape.
Make s’more as desired.