Bayern 5-1 Cologne
Eric Maxim Choupo-Moting opened the scoring before Lewandowski converted Leon Goretzka’s pass to make it 2-0.
Ellyes Skhiri reduced the arrears, but Thomas Muller teed up Lewandowski to restore the hosts’ two-goal cushion.
Gnabry scored twice in the final 10 minutes to complete a comfortable win.
The victory lifts Bayern five points clear of second-paced RB Leipzig, who face Borussia Monchengladbach later on Saturday.
Poland striker Lewandowski has now scored 28 Bundesliga goals this term – nine more than any other player in the division.
With 11 league games remaining, the 32-year-old is on target to beat Gerd Muller’s record of 40 goals in a Bundesliga season, set in 1972.
BBC