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

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

Michael has his own salad dressing brand Great Scott : r/DunderMifflin

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

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

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Looks aMAIZEing! : r/BlockedByJax

What is the Great Scott jar on Michael's desk in S04E02 Dunder Mifflin Infinity? : r/DunderMifflin

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