How do you change a flat cookies to fat cookie?

The terms "flat" and "fat" are describing the *appearance* of a cookie, not its *content*.

* Flat cookies are usually thin and spread out. This can happen for a few reasons:

* Too much liquid in the dough

* Not enough fat in the dough

* Over-mixing the dough

* Not using enough flour

* Fat cookies are usually thick and have a more pronounced shape. This is usually due to:

* Using more fat in the dough

* Using less liquid in the dough

* Under-mixing the dough

* Using more flour

To get the desired consistency, you'll need to adjust your recipe or baking technique!