I find when I follow the directions my cookies turn out tiny and rock hard. They still taste great and soften up nicely dipped in milk, so don’t toss them if yours turn out too hard. I make the dough balls bigger, more like 1 1/2 inches and cook it for the minimum time on parchment paper.
As ovens vary, you’ll have to see what works best for you. The taste is worth playing around to get it perfect.