What does America's proverb 'I can't believe it's not butter' mean

What is the native version of this Russian proverb: The same hammer that shatters glass forges steel? - Quora

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all butter, really flaky pie dough – smitten kitchen

What is meant by the American proverb 'nationwide is on your side'? - Quora

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What actually is I Can't Believe it's not Butter? - Quora

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If 'I can't believe it's not butter' is not butter, what is it ? Is it just better butter? How? - Quora

Butter Quotes - BrainyQuote