These are DELICIOUS!! They also have a delicious aroma, too - my whole house was very interested in what I was baking. I made one modification after my first batch came out burned - bake at 400 rather than 425. This makes the cookies a perfectly soft texture and the marshmallow golden but not dark and hard.
Also, make sure you put the marshmallow on the cookie with the sticky side DOWN. When I didn't do this, half the time the marshmallow slid off the cookie! 😥