Step 1: Make a game on T6 Adventure mode and look for the bounty in Act 2 called "A Miner's Gold", this bounty does not require you to kill any mobs to complete it.
Step 2: Invite 3 other people to get even more experience.
Step 3: Start the quest and kite the mobs away from the quest npc so that he can complete the quest for you.
Eventually the quest will complete and you will receive at least 1 level worth of experience and a good amount of gold.
Saw this on Datmodz stream so I will not take credit for discovering this. Good luck guys!