A s'mores protein cookie stuffed with melted chocolate chips and marshmallows that's ready in 5 minutes or less.
Mix the mug cookie dough ingredients in a bowl until you can form a ball of dough.
Using your hands (spray them with a bit of cooking spray if the dough sticks), flatten the cookie dough into a thin circle.
Place the cookie dough inside a wide mug or a small bowl before adding the chocolate chips and marshmallows. (You might notice I'm using regular chocolate chips in the photo. The mini chocolate chips melt faster in the short cook time.)
Fold the edges of the cookie dough up and around the marshmallows and chocolate chips. You can also do these steps on a flat surface if your mug is on the small side and just transfer to the mug when it's ready to go.
Microwave the mug cookie for 30-40 seconds. You want it to be slightly soft since the dough can get tough when overcooked. As soon as the chocolate chips and marshmallows are melted, I would pull the cookie out and dig in. Since we're not using eggs, there's no concern about eating a slightly undercooked cookie!