Using a hand mixer, combine brownie mix, butter, and eggs until a thick dough forms.
Fold in marshmallows, almonds, and chocolate chips.
Refrigerate dough for about an hour.
Roll cookie dough into 1.5" balls and place on a lined cookie sheet. Add a few additional marshmallows to the top of the rolled cookies.
Bake at 350℉ for 8-10 minutes, until the outside of the cookies are set.
Notes
These can be stored at room temperature and should be enjoyed within 5-6 days of baking.
Use a hand mixer to make the brownie cookie base - you're going to have a thick cookie dough that is difficult to mix by hand. However, the add-ins need to be folded in by hand to ensure that they don't break apart.
Refrigeration is key for this cookie dough. Without chilling the dough, you'll get a flat, crunchy cookie. A chilled dough will give you a fudgy, thick cookie.
Just bake the cookies until the top/edges start to set - you don't want to overbake the cookies, as they will dry out quickly.