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Place milk in bowl
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Sift flour, salt and baking powder together into large mixing bowl.
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Beat eggs until foamy and pale in color; add warm milk.
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Gradually add flour mixture and beat on medium speed for about 2 minutes.
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Let batter rest for 1 hour at room temperature (this is an important step).
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Preheat oven to 450F and spray popover or muffin pans with cooking spray (Pam).
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Fill popover cups almost to the top with batter and place popover tin on cookie sheet.
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Transfer to oven and bake for 15 minutes.
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Reduce temperature to 375F and bake for 30 to 35 minutes longer, until popovers are deep golden brown outside and airy inside.
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Turn out popovers and serve hot with strawberry butter.