Lightly coat the bottom of a 12-inch bamboo steamer with nonstick cooking spray.

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Heat 1 tablespoon of the butter with the remaining 2 tablespoons of olive oil in a large nonstick skillet over medium-high heat until the butter melts and sizzles.

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DuPont is fighting a similar battle over perfluorooctanoic acid (PFOA), a chemical used to manufacture Teflon nonstick coatings that lawyers say lingers in cookware and can be released under high heat.

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Heat a 10-inch nonstick skillet over medium heat.

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