@HKRayneIf you use your action to do a non-spell action, could you use your bonus to cast a cantrip? Yes.
— Jeremy Crawford (@JeremyECrawford) March 10, 2017
@JeremyECrawford @HKRayne Have seen people to take that part to mean BonusAction cantrip every turn w/any cantrip.
— Brail (@BrailSays) March 19, 2017
To cast a spell as a bonus action, its casting time must be 1 bonus action or you must have a special feature that lets you do it. #DnD https://t.co/cevBJCRcZS
— Jeremy Crawford (@JeremyECrawford) March 19, 2017