In The Office episode 'Dunder Mifflin Infinity' Michael has his homemade salad dressing on his desk, Great Scott. Referenced in a deleted scene from the previous episode 'Fun Run'. : r/TVDetails

The Office' has new never-before-seen clip

Dunder Mifflin Infinity, Dunderpedia: The Office Wiki

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

Dunder Mifflin 2.0 - The Office US

In a deleted scene from Fun Run (link in comments), Michael mentions that he makes and sells his own salad dressing by combining Newman's Own Ranch with Newman's Own Italian. In the next episode, there's a jar of it sitting on his desk. : r/DunderMifflin

The Office' series finale: Dunder Mifflin gang signs off after eight years – with Michael Scott making a surprise return – New York Daily News

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

The Office: November 2007

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use

Dunder Mifflin Inc memo - Dunder Mifflin Inc. To: Dunder Mifflin Employees From: Michael Scott Vice President Date: February 28 2014 Subject: Drug use