Mix the sugar, brown sugar, and butter using a stand or hand mixer. You want the mixture to be light and slightly clumpy.
Add the eggs and vanilla and mix until creamy.
In another bowl, add the flour, hot cocoa powder, and baking soda and mix until incorporated.
Gradually mix the cocoa mixture with the wet ingredients. Soft cookie dough will form.
Fold in the chocolate chips and 1 cup of marshmallows.
Roll the dough into balls by using a small cookie scoop to measure each cookie. Place the formed cookie dough on parchment inside the air fryer basket. Leave some space between cookies.
Cook at 300°f for 10 minutes. At 6 minutes, top each cookie with 2-3 marshmallows from the remaining amount which will flatten the cookies.
Once cooked, remove the cookies and place them on a baking rack to allow them time to cool.