The on-loan Chelsea striker struck twice yesterday for the 3-2 win.
And Stoger beamed afterwards: "Batshuayi? He spent a lot in the last few games, so I left him on the bench initially.
"I wanted to put pressure on him - and he exploits his chances so well. He's a real pleasure."
The coach added: "I've seen the best Borussia Dortmund in recent weeks."