Is this correct One of the best things about reading short stories are that you can complete them in one sitting?

The sentence is grammatically incorrect. The correct version is:

"One of the best things about reading short stories is that you can complete them in one sitting."

Here's why:

* Subject-Verb Agreement: "One" is a singular subject, so the verb must be singular as well. "Are" is plural.

* "Is" is the correct singular form of the verb "to be" in this context.