Line a 9x13 pan with wax paper, non-stick foil, or partment paper.
Put gelatin and first ½ cup water into a mixing bowl and set aside.
Heat sugar, maple syrup, corn syrup, salt, and the other ½ cup of water covered over medium high heat for approximately 5 minutes.
Uncover and continue heating until the mixture reaches 240 F.
Remove from heat.
Begin beating the gelatin mixture with the whisk attachment of the mixer, and slowly stream in the syrup mixture.
Increase the mixer to high speed (do this slowly to avoid splatter!) and beat an additional 10 minutes.
Add in Rice Krispies and mix well.
Spread evenly into prepared pan.
Let set, then cut into squares.
Notes
Be sure to spray your spatula with nonstick spray before mixing in the cereal. The marshmallow filling will be extra sticky, and this will make it easier to stir.It may be easier to press the Rice Krispie mixture into the baking dish with your hands instead of a spatula. If you do this, put a little bit of non-stick spray or oil on your hands to keep the marshmallow from sticking to your hands.