I found this recipe via Pinterest, and I had to try it because I didn't understand how it would work. You end up with a thick jello layer that settles to the bottom, and a light marshmallow layer that rises to the top. My kids (and their friends) went absolutely bananas for these! I'm a little wierded out by the texture of them because it's like nothing else I've ever eaten...but I love that they only took me 5 minutes to make, and you can make them any colour or flavour that you like to match a holiday or a themed party.
Spray an 8-inch pan with non-stick spray.
Pour warm water in to a large microwave-safe bowl, and stir the jello to dissolve. Microwave on high for 1 minute. Add the marshmallows and stir to coat, then microwave on high for 1 1/2 minutes. The marshmallows will be puffy and soft. Stir the marshmallows to dissolve. Pour into prepared pan and refrigerate several hours until completely set.
Starting at one end, roll tightly like cinnamon buns.Cut in to spiral slices and chill until serving.