"How can you get rich by eating?"/"Eat…

A fortune cookie riddle is:

Q: How can you get rich by eating?
A: Eat fortune cookies.

The joke has been cited in print since at least 1976.

Wikipedia: Fortune cookie
A fortune cookie is a crisp cookie usually made from flour, sugar, vanilla, and sesame seed oil with a piece of paper inside, a “fortune”, on which is an aphorism, or a vague prophecy. The message inside may also include a Chinese phrase with translation and/or a list of lucky numbers used by some as lottery numbers, some of which have become actual winning numbers. Fortune cookies are often served as a dessert in Chinese restaurants in the United States and other Western countries, but are not a tradition in China. The exact origin of fortune cookies is unclear, though various immigrant groups in California claim to have popularized them in the early 20th century. They most likely originated from cookies made by Japanese immigrants to the United States in the late 19th or early 20th century. The Japanese version did not have the Chinese lucky numbers and was eaten with tea.

Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustrations by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 70:
How can you get rich by eating?
Eat fortune cookies.

10 March 2002, Sunday Telegraph (Surry Hills, New South Wales), “The Funday Telegraph” by Matthew Frilingos, pg. F1:
How can you get rich by eating?
Eat fortune cookies

Google Groups: alt.humor.puns
Puns of the Weak 01-02-04 Part 2 The Puns
Stan Kegel
1/3/04
(...)
How can you get rich by eating?
Eat fortune cookies. (Kids Jokes)

Twitter
Best Jokes‏
@best_jokes
How can you get rich by eating? You should eat fortune cookies…
12:08 PM - 4 Oct 2009

Twitter
Richard S. Ward‏
@RichardSWard
How can you get rich by eating?Eat fortune cookies.
6:04 AM - 2 Jan 2010

Twitter
Renee Taft‏
@ZimmerliJay
How can you get rich by eating?Eat fortune cookies.
1:22 AM - 3 Jan 2010

Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
How can you get rich by eating?Eat fortune cookies.

Twitter
Lucky Score‏
@LuckyScoreNet
How can you get rich by
eating?
Eat
fortune cookies.
#Joke from #MoneyJokes in #Jokes, #Humor and #Satire
3:42 PM - 21 Aug 2017

“How can you get rich by eating?”/“Eat fortune cookies.”