Spray the pan evenly with cooking spray making sure that you get into the corners.
In a medium sized mixing bowl, whisk together 1 package of red jello and 1/2 cup of water. Be sure the powder fully dissolves. If you are having a hard time getting the powder to dissolve, pop the bowl in the microwave for 1 minute on high heat.
Add 1 cup of the mini marshmallows and stir them in. Place in the microwave for 1 minute on high heat. Take out and give it a good stir. Make sure all the marshmallows have melted.
Pour the jello marshmallow mixture into the pan prepared with nonstick spray.
Place in the fridge to set for 1 hour.
In a medium sized mixing bowl, whisk together 1 package of green jello and 1/2 cup of water.
Add 1 cup of the mini marshmallows and stir them in. Place in the microwave for 1 minute on high heat, then remove and stir. Again, make sure all the marshmallows have melted.
Allow the green jello to cool for 5-7 minutes.
Check to make sure the red layer has completely set. If it hasn’t, allow for more time in the fridge.
Pour the green layer directly over the red layer and make sure it fully coats the red layer.
Place in the fridge for another 55 minutes.
Remove and use a spatula or knife to loosen the edges of the jello. It should lift very easily.
Starting at one end, start rolling the jello until it forms a log and place the toothpicks along the edge holding the seam down. Give yourself an inch and half between toothpicks.
Place on a cutting board and using a sharp knife, cut in between each toothpick.
Keep refrigerated until you are ready to serve.