Schalke, beaten 6-1 at home by Real Madrid in the Champions League on Wednesday, shipped another four in the first half hour at Bayern.
David Alaba opened the flood gates with a free kick which took a wicked deflection, then Robben scored twice and Mario Mandzukic headed the other.
"It was one of the best first halves I've seen since I've been here. We were aggressive and didn't let them play," Robben told Sky.
Schalke reduced the arrears when Rafinha put through his own goal in the 64th minute but Robben completed the scoring with a penalty harshly awarded after Kyriakos Papadopoulos nudged Mandzukic.
To add insult to injury, the referee judged it was a clear scoring chance and Papadopoulos was sent off, prompting a furious reaction from the Greek who could be in further trouble for a finger-wagging protest to the referee.
- Sports & Recreation
- Mario Mandzukic
- Kyriakos Papadopoulos