AGATHA: … But after that, I’d better see some cake.
TARVEK: You know, there’s more to being an evil despot than getting cake whenever you want it.
AGATHA: If that’s what you think, then you’re doing it wrong!

Phil Foglio (b. 1956) American writer, cartoonist

Girl Genius, Vol. 13, p. 38, “The Heterodyne Requires Cake” (10 Apr 2013)
    (Source)

In Agatha H. and the Siege of Mechanicsburg (2020) [with Kaja Foglio], this is rendered:

“But after that, I’d better see some cake.”

Tarvek glanced at her. “You know, there’s more to being an evil despot than getting cake whenever you want it.”

Agatha thought about this and was filled with a sudden conviction, one that would stand the test of time through everything else that happened to her through the years. “If that’s what you think, then you’re doing it wrong.”