Japanese midfielder scored his first competitive goal for the Bavarians, who rebounded from Sunday's Bundesliga loss to Hannover with a comfortable win
Coach Jupp Heynckes opted to rest Franck Ribery, Mario Gomez, Bastian Schweinsteiger, Manuel Neuer, and captain Philipp Lahm, but the hosts were nonetheless able to earn a convincing victory at the Allianz Arena.
It took 33 minutes for the German record champions to take the lead, but Thomas Muller finally broke the deadlock. Ingolstadt managed to enter the half-time break only a goal behind, but collapsed after the interval, as David Alaba and Nils Petersen contributed efforts in the opening minutes of the second half. Marvin Matip scored a late own goal before substitute Takashi Usami netted his first competitive strike for Die Roten in a one-sided match.
Bayern's opener came under somewhat fortuitous circumstances, but was perhaps inevitable given the run of play. Muller cut in from the right and fired a low effort that goalkeeper Sascha Kirchstein appeared to have covered, before defender David Pisot changed its trajectory as the ball nestled itself in the back of the net.
Four minutes after the break, Alaba got his name on the scoresheet as he tiptoed across the edge of the box before driving a low strike into the net. Petersen made it 3-0 on 54 minutes as he finished from Diego Contento's through ball, and completed his brace following a lovely ball from Toni Kroos.
Late in the game, Matip failed to clear Rafinha's cross and instead put the ball into his own net. Finally, with the last kick of the game, Usami found himself through on goal and made no mistake as he fired a low effort just inside the far post.
The result marks Bayern's first win and clean sheet in three games, as they advance to the DFB Pokal round of 16. Ingolstadt crash out and can now focus 100 per cent on the 2. Bundesliga, wherein they currently sit last in the table.