If you want the classic
104 recipes
Pull it pale and early
The classic sugar cookie is soft because of when it left the oven, not because of what went in the bowl.
This cookie reads its clock by colour absence: take it out just-set and barely coloured, while the middle still looks undercommitted. Cooks who did that clustered around nine minutes. Leave it for colour and you have made the crisp version, which is a perfectly good cookie and a different one from what you asked for.
The tell: edges set, no real browning anywhere, centre still matte.
If you want the pillow
98 recipes
Build a Lofthouse instead of underbaking a classic
The thick, pale, frosted supermarket cookie is engineered not to spread, and you cannot get there by pulling a classic early.
It is a different formula: a softer flour or a little cornstarch standing in for the commercial cake flour, and cream of tartar, which this dish borrows knowingly from its snickerdoodle cousin. The frosting is not decoration on this one either, it is part of how it stays soft. Start from a recipe written for it rather than adapting one that was not.
Why it matters: the sugar level that looks like this dish's median is an average of the two modes and describes neither. Pick a mode, then follow it.
Either way
three reports
Frost them and seal them, then judge tomorrow
These cookies soften overnight, which means a cookie that seems slightly overbaked tonight is often fine by morning.
Cooks reported sealed containers reading super-soft the next day, foil laid over the icing as a deliberate anti-hardening move, and slightly overbaked batches rescued simply by frosting and storing them. The icing donates moisture and the sealed box keeps it in the cookie. It is the one dish on this site where waiting is a technique.
The exception: an unfrosted classic stored naked almost certainly stales the ordinary way. Our cooks did not store them that way, so we cannot tell you how fast.