The phrase "a cookie for a" is not complete and lacks context, making it difficult to determine its correctness in written English.
It could be used in contexts where you are discussing a reward or incentive, but it needs to be part of a fuller sentence to convey a clear meaning.
Example: "I promised my child a cookie for a job well done on their homework."
Alternatives: "a reward for a" or "an incentive for a".
It turns out that when both the American and British waiters offered baked goods, the twins usually ordered the same thing — a brownie or a cookie for each.
When flooding a cookie, for example, you probably want a runnier icing.
A researcher would bring two treats — a big cookie and a little cookie, for instance — to a child alone in a room and give him a choice.
Martin discovered an authentication cookie for a financial website, Motherboard reported.
The scientists also eliminated the bacteria that cause the apple to turn brown by applying more than 6,000 atmospheres of pressure to the cookie for a tenth of a second.
However, you may be trading off that cookie for a smaller sandwich -- according to a blog on Nation's Restaurant News, the bacon cheeseburger here is the smallest of all the sandwich offerings currently touted.
For example, using a picture of an oatmeal cookie for a cookie company, or calling a video game company "Games Forever".
(Although "augmented gustation," as they dub this, also requires the VR player to have an olfactory cap on their head which puffs flavored air into their nostrils at the moment of mastication, corresponding with their taste choice, in order for them to experience the sensation of a eating a chocolate cookie, for example. So it's getting pretty out there, even by VR standards…).
Cookies may also be used for tracking purposes: a cookie lets a Web site uniquely identify the user (on a given computer) and link to her all Web pages she visited on that site.
Place each piece on a cookie sheet (for best results, use a stone cooking platter).
