Play with the fanciness and deliciousness of a patisserie, and the unbelievability of high-fat being healthy (it is, cuz science).
"Fatisserie" should be in a whimsical font with emphasis on the 'F,' and must be readable (e.g., don't go too swirly with script fonts, in order to maintain readability).
"KETOGENIC DELIGHTS" should be in all-caps in a narrow block typeface, to lend a clinical and serious quality. I like designs that put dots on either side of "KETOGENIC DELIGHTS," so this is something to play with if it feels right to you.
A graphical motif that evokes ice cream is necessary. Stylistically it should harmonize with "KETOGENIC DELIGHTS". The ice cream motif can be as a cone or a cup, with priority on recognizability (since I can't print "ice cream" on the carton for FDA reasons). A cup is better than a cone since cones aren't ketogenic, but again: recognizability is the priority. While recognizable, a soft-serve look is not ideal since soft-serve is associated with lower quality. Anything that evokes lightness, fine texture and high-quality (like the way high-quality ice cream splits and striates as it is scooped) is a good thing.