The One Secret Step Everyone Skips for the Crispiest Cheesy Smashed Potatoes
Boiling potatoes hydrates raw starches and swells cell walls. When you crush a freshly boiled tuber, internal moisture flashes into steam. Slathering that hot, wet surface with cold butter or oil traps water vapor underneath a hydrophobic grease slick.
The trapped water boils in place instead of evaporating. That steams the exterior skin from below, guaranteeing a leathery, rubbery rim rather than a brittle edge. Professional test kitchens eliminate this issue through forced evaporation. Letting the crushed tubers sit exposed to open air on a hot tray allows the white plumes of vapor to dissipate completely, leaving behind a rough, chalky white film of dehydrated starch granules ready for high-heat frying.
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cheesy smashed potatoes recipe