That tip is usually pointing to cream cheese (or sometimes crème fraîche).
Why it works:
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Cream cheese adds fat + tang, which makes mashed potatoes ultra-smooth and rich without thinning them out like milk or water.
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It emulsifies well, so the potatoes stay creamy instead of turning gluey.
How chefs use it:
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Add 2–4 tablespoons of cream cheese per pound of potatoes
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Warm it slightly before mixing so it blends easily
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Still finish with butter and salt (but you’ll need less liquid overall)
Close runner-ups you’ll also see chefs use:
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