“How big does a cupcake have to be before it’s just a cake?” is a saying that has been printed on an ecard. “How big does a cupcake have to be before it’s no longer a cupcake? Is just baking it in a paper cup enough?” was posted on Twitter on July 17, 2009. “How big does a cupcake have to be before it becomes a cake?” was posted on Twitter on January 26, 2010.
 
“How big does a cupcake have to be before it’s just a cake?” was posted on Twitter by Witchy Woman on August 21, 2012.
 
     
Wikipedia: Cupcake 
A cupcake (also British English: fairy cake; Hiberno-English: bun; Australian English: fairy cake or patty cake) is a small cake designed to serve one person, which may be baked in a small thin paper or aluminum cup. As with larger cakes, icing and other cake decorations such as fruit and candy may be applied.
 
Twitter 
Caitlin Fitzsimmons 🧜‍♀️
@niltiac
Replying to @kujunat
@kujunat How big does a cupcake have to be before it’s no longer a cupcake? Is just baking it in a paper cup enough?
3:14 PM - 17 Jul 2009
   
Twitter
Rod Campbell
@Roddee
Replying to @nabejero
@nabejero saw this on Twitter can’t remember who / how big does a cupcake have to be, to be a cakecake?
11:35 PM - 25 Nov 2009
   
Twitter
dbryceg
@DbryceG
How big does a cupcake have to be before it becomes a cake?
4:54 PM - 26 Jan 2010
 
Twitter
Witchy Woman
@dreamthievin
How big does a cupcake have to be before it’s just a cake?
8:53 PM - 21 Aug 2012
 
Funny Status
How big does a cupcake have to be before it’s just…
January 29, 2013 Food Status Updates
How big does a cupcake have to be before it’s just a cake?
     
Twitter
Cristlin
@CristlinGrey
Just how big does a cupcake need to be before it’s an actual cake 🎂❓❔
10:12 PM - 9 Sep 2016
 
Twitter
Bill Murray
@BiIIMurray
How big does a cupcake have to be before it’s just a cake?
8:02 AM - 1 Apr 2018