Giulia Gwinn put Bayern Munich 1-0 up on penalties after just under half an hour, and Linda Dallmann extended it to 2-0 in the 53rd minute.
The final nail in the coffin then hammered Glas in, when the right-back stayed ahead and nodded in 3-0 on the corner after just over an hour of play.
Bayern thus passes Wolfsburg and regains first place by a margin of two points after 14 rounds.
Wolfsburg, who have a match to spare, meet Sand away on Monday.