To borrow a truism from carpentry, you should "measure twice, bake once" when you're trying out new recipes.
Check out what happened when I was developing my Flat, Crunchy Chocolate Chip Cookies.
The proof is in the...er, um...cookie. In this photo, the cookie on the left includes twice the flour and oatmeal than the cookie on the right. All the other ingredients are the same, but my misreading of my own recipe lead to the dry plumpness that is the cookie on the left.
I couldn't figure out what I had done wrong, and then it hit me like a dozen dough ball-shaped cookies: I had used the incorrect amounts of dry ingredients. Duh!
Yes. I am the Oatmeal Cookie Guy, and I oopsed! Learn from my mistake and make sure you read your recipes carefully. Otherwise, the flat, crunchy cookie you were hoping for will turn out plump and crumbly.