"Kanapka to chleb, ser i mięso."
Translation:A sandwich is bread, cheese and meat.
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I think it would be very weird, although this sentence is already weird.
We could say that this sentence means "a sandwich = bread+cheese+meat". It's a bit clumsy and it only describes one type of sandwiches, but let's say it's okay.
With Instrumental, it would be as if we said that a sandwich is a type of "bread+cheese+meat". It just doesn't work.