Drop in your food coloring, I do 2-4 drops each color for a light mint. Whip until the mallow mix is pulling from the sides.
Oil a large 13x9” cake pan.
Melt the chocolate in the microwave in 30 second increments. Stop when it’s mostly but not fully melted. Stir until it’s all liquid.
When the mallow mix is ready pour half of it into the oiled pan. Spoon half the chocolate over the bottom layer of the marshmallow, in little piles (see video for reference).
Add the rest of the marshmallow mix on top, then repeat with the chocolate. Using a toothpick of offset spatula, swirl the mix.
Cover with foil and set in the fridge for 2 hours.
When you are ready to slice, coat the countertop in a thin layer of powdered sugar. Set some powdered sugar in a bowl (½ cup is usually enough).
Transfer the now firm, large marshmallow onto the countertop. Oil a chef’s knife and slice the mallows into cubes. Dust with powdered sugar in the bowl.
Store in an airtight container. Mallows keep for 3 weeks at room temperature.