Adjectives

(s)bantering, facetious, tongue-in-cheekcleverly amusing in tone“a bantering tone”, “facetious remarks”, “tongue-in-cheek advice”

Adverbs

(r)banteringly, tongue-in-cheekin a bantering fashion“he spoke to her banteringly”
(r)facetiously, jokingly, tongue-in-cheeknot seriously“I meant it facetiously”