How do we use the word 'goodness' correctly?

[Eagle]

Hello.

I have a question about this use of goodness:

On a box of cookies, the slogan says: Simply goodness.

What does mean in that expression.

Thanks in advance

[Mister Micawber]

.
You must in general beware of the supposed grammar of advertising slogans. I would have to have a sample cookie to be sure, but this slogan likely means that these cookies contain simple and delicious ingredients and are 100% good, and there is nothing more to be said about them.
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_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber