Cantrip Mastery, Variant (5e Feat)
From D&D Wiki
Prerequisites: The ability to cast at least one cantrip
Faster cantrip casting
You have focused on one cantrip and have perfected it with speed.
- Choose one cantrip you know with a casting time of one action. You can now cast it as a bonus action a number of times equal to your spellcasting ability modifier. You regain all uses after finishing a long rest.