Turn on the oven to warm up at 180°C.
Cream the vegan butter and sugars using your standing mixer or hand mixer. Once soft and fluffy, add the milk and whisk in until fully folded.
In a separate bowl, measure and mix the flour, cocoa powder, baking soda and salt.
Fold in the dry ingredients in your wet ingredients until everything is combined. The dough will be sticky and soft, so don't fret.
Add the chocolate chips and the chopped vegan marshmallows and combine them in the dough.
Shape the cookies into balls, then place them on your cookie tray covered with parchment paper and add a marshmallow on top.
Bake for 12 minutes, or until the edges start to firm up.
Once ready and out of the oven, bang the tray on the counter to flatten them and let them cool completely before serving.