Please Note: You will make the mint and chocolate layer one at a time. Choose which layer you would like on the bottom and make that one first. If you don't want a chocolate layer, simply omit.
This process is the same for both layers: Turn the mixer to low and slowly drizzle the hot sugar syrup mixture into the gelatin. Drizzle slowly and consistently until all the syrup is in the bowl. Use a silicone scraper to remove all the syrup you can from the bowl.
Place the collar on your stand mixer to prevent splashing. If you're mixing in a bowl, be sure to use one with steep sides. Turn the mixer to high with the whisk paddle(s). Whip for 8 to 20-ish minutes. See notes for specifics.
If adding color and mint flavor to the mint layer, add it now and whip it in thoroughly. Always remember to move quickly at this phase. Once the fluff has formed, it gets stickier and sticker with each passing minute.
Scrape into your prepared, parchment-lined dish and level. I like to place the chocolate layer on the bottom, then add the mint. Remember, you will make each layer one at a time (unless you have two of every piece of equipment and an awesome helper).
Cover with a baker's rack to allow for ventilation and then a light towel (like a tea towel) to keep out critters and dust. Set aside to cool. 4-6 hours will do for softer marshmallows; 8-12 for drier marshmallows.
Once dried to your liking, cut into serving sizes and dust in powdered sugar or any of the suggested combinations in the article. Serve or package to give away. These will last for months at room temperature, though the flavors may begin to fade/change over time.