Prepare an 8x8 pan with a layer of parchment paper and spray well with baking spray. Another option is to coat with butter if you prefer!
Add the sugar, first corn syrup and water into a pot and cook to 235-240 degrees Fahrenheit. It’s extremely important to pay attention to the temperature of this mixture – this will determine the texture of your marshmallows.
1 Cup Granulated Sugar, 3 tablespoon Light Corn Syrup, ¼ Cup + 1 teaspoon Water
Meanwhile, add the cold water and gelatin together mixing briefly with a fork to combine. Let it set for a few minutes.
¼ Cup + 1 teaspoon Cold Water, 1.5 tablespoon Gelatin
Add the second addition of corn syrup and bloomed gelatin into the bowl of your standing mixer. Pour the hot syrup mixture into the bowl as well and using the whisk attachment, whisk until the mixture for at least 6-10 minutes. You will see that the mixture will become white, glossy, and at least doubled in size. The bowl will feel cool to the touch instead of hot/warm once it is ready to stop mixing.
¼ Cup Light Corn Syrup
Pour in the melted chocolate while slowly whisking until the mixture turns a light, chocolate brown. Then, remove the bowl from your mixer and fold in the chocolate delicately with a spatula until there are no remaining streaks of white.
⅔ Cup Dark Chocolate
Pour the marshmallow mixture immediately into your prepared pan and allow the marshmallows to start setting for about 10 minutes before adding cocoa nibs on top.
¼ Cup Cocoa Nibs for Garnish
Let marshmallows sit at least a few hours or overnight before cutting into desired shapes.
As marshmallows are quite sticky, I like working with a sharp knife and a tall glass of hot water. This will allow the marshmallows to have extra sharp and clean edges. After each cut, dip your knife in hot water, wipe away any residue and continue cutting.
Sift together the powdered sugar and cocoa powder into a bowl or plate with taller sides. Coat the sticky sides of each marshmallow with the mixture to prevent them from sticking to each other, sift a bit on top then store in an airtight container.
2 Tablespoons Cocoa Powder , 2 Tablespoons Powdered Sugar