Question: is stunning strike a bonus action?
Answer: You could Attack (Action), spend 2 Ki to use Stunning Strike twice (Useable when you hit with a Melee Weapon which includes your Unarmed Strikes, one for each attack due to Extra Attack), spend 1 Ki to use Flurry of Blows (Bonus Action), spend 2 Ki to use Stunning Strike for both of those attacks use Action Surge (Any ...