Here is the recipe adapted from Studio Diy:
3 packages unflavored gelatin (1/4 ounce packets)
3/4 cup water
1/2 cup water2 cups sugar
1 cup corn syrup
1 tablespoons vanilla extract
1-2 drops of mint essential oil or 1 tsp mint baking flavoring1/2 cup powdered sugar mixed with 1/2 cup cornstarch for dusting
food coloring (I went with two shades of green for the mint look)
1. Prepare your pan and two mixing bowls with spoons for mixing the colored marshmallows. To prepare the pan, spray with cooking spray and then dust with the cornstarch and powdered sugar mixture to coat the entire pan.
2. Mix the gelatin and 3/4 cup of water in your mixing bowl and let sit so the gelatin can bloom
3. Mix the rest of the water, sugar, and corn syrup in a pan and heat over medium heat until the sugar dissolves. Once the sugar dissolves, raise the temperature to high and use a candy thermometer to get the sugar mixture to 240 ºF.
4. When the mixture reaches the temperature, turn on the mixer and mix the gelatin mixture. Slowly stream the sugar mixture into the mixer on medium speed. Once all the sugar has been added, increase the mixture speed and mix for apps. 6 minutes. Then you will added the vanilla and mint extract and mix for another few seconds until well combined.
5. Divide the marshmallow mixture into the bowls and add your food colorings and mix until combined. You will want to work quickly before the marshmallows start to set up.
6. Once the marshmallows are mixed, start by dropping dollops of each color into the pan. Once they are all added to the pan, use a chopstick or spoon to gently swirl the mixture to create a marbled effect.
7. Dust the top with more of the powdered sugar mixture and let set for several hours to overnight to set up.
Once the marshmallows are ready, pair them with some chocolate and chocolate graham crackers and enjoy the deliciousness!