Marshmallow Chocolate Chip Cookies

https://www.youtube.com/watch?v=sj-8LOVtSJA&t=6s


Ingredients 
100g Unsalted butter 
80g Dark brown sugar 
50g Brown sugar 
1 Egg 
2g Vanilla etract 
120g Bread flour 
80g All-purpose flour 
2g Baking soda 
1g Salt 
80g Dark chocolate 
Marshmallow