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

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

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

I Can't Believe It's Not Butter!

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Court dismisses I Can't Believe It's Not Butter calorie lawsuit

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

ZOE Podcast: Butter vs. margarine: What does science say?

Why can't I believe it's not butter? - Quora

I Can't Believe It's Not Butter!®