My favorite disher, (for ice cream and cookie dough), is a 2 tablespoon scoop so that's what I used. I thought they were the perfect size. Maybe that's because I feel better eating 6 cookies rather than 3, regardless of their diameter.
I checked them for 15 minutes, but ended up leaving them in around 17 minutes. Maybe my oven's off temp since I don't currently have a thermometer in there, but they were golden brown on the inside and had a great texture once they cooled.
So I had one that was warm and I had one, (or two), when they cooled. I hear hey're good before bed and also good for breakfast, well brunch.
There was one casualty-an adventurous cookie tried to explore the world around the cooling rack-but it turned out to be just as tasty as its round little friends.