The German champions averaged a goal just under every four minutes as Corentin Tolisso scored four and Robert Lewandowski hit a hat-trick.
Lucas Hernandez made his first appearance since his club record 80m euros (£68m) move from Atletico Madrid.
Bayern get their league campaign under way against Hertha Berlin on Friday, 16 August at 19:30 BST.
Before that, Bayern begin their defence of the German Cup on Monday, 12 August when they travel to FC Energie Cottbus (19:45 BST).
Otschi Wriedt also grabbed a hat-trick while Thomas Muller and New Zealand international Sarpreet Singh both scored twice.
Coach Niko Kovac made 10 changes at half-time against opponents they defeated 20-2 in 2018.