Whisk 3 tablespoons of the milk along with the bottom flaxseeds in a big mixing bowl. Let the combination sit for a minimum of 5 minutes, to gel.
Whereas the flax combination sits, whisk the flour, cocoa, baking soda, baking powder, salt, and cinnamon collectively in a big mixing bowl.
Add the butter, sugar, and brown sugar to the bowl containing the flax combination. Use an electrical mixer to cream the elements collectively till gentle and creamy, about 1 minute.
Cut back the velocity of the electrical mixer to low, then slowly drizzle within the remaining 4 tablespoons of milk with the mixer operating. Add the vanilla extract, then start including the flour combination, including it in about three or 4 increments and beating each in completely earlier than including extra.
Cowl the bowl and place it within the fridge. Chill for one hour, till the dough is agency however nonetheless scoopable.
Preheat the oven to 350°F and line a few baking sheets with parchment paper.
Scoop the dough by heaping tablespoons, rolling every scoop right into a ball and putting them on the baking sheets a minimum of 2 inches aside.
Place the baking sheets into the oven and bake the cookies for 8 minutes.
Whereas the cookies bake, minimize the marshmallows in half, lengthwise.
After 8 minutes within the oven, the cookies ought to have unfold out and overrated. If not, give them a minute or two extra. In the event that they’re prepared, take them out of the oven however depart it on. Press a marshmallow half into the highest of every cookie. Return the baking sheets to the oven for 3 to 4 minutes.
Place the baking sheets on a cooling rack. Let the cookies cool utterly on the baking sheets.
As soon as the cookies are cool, place the chocolate chips right into a medium microwave-safe bowl. Microwave them in 20-second increments, stirring nicely in between, till totally melted, which ought to take about 3 or 4 zaps.
Spoon a little bit of the melted chocolate over every cookie, masking the marshmallow. Let the cookies sit till the chocolate has totally set, about half-hour, then serve.
