Sorry the pictures for this are not very detailed, I wasn't sure I was even going to make a guide and the kids were helping lol
Heat about a cup or so of milk, how ever much you're going to need to make how ever much you're making. Whole milk or even half and half works best.
Mix about a tablespoon or so of yogurt with the powdered hot Cocoa.
Add a splash of cold milk.
Stir it up until it's liquid but still thick.
Add the heated milk and stir, toss in some mini marshmallows and drink up! It'll have a little bite to it from the Greek yogurt and it'll be very creamy! Enjoy and then makes some more lol