I tried the recipe as written and the popovers were wonderful. I decided to make some the following morning @ 4:am. This is the same morning that I decided to give up caffine. This this was risky..but I motivated. You offered fool proof, so I decided to experiment on the supposition you had factored a margin of errors in the recipe. Well here goes. Four lg eggs two without the yokes, (for health, oops and I forgot the butter ).1 1/2 teaspoons of vanilla, 2 tsp of powderd suger and a subsitution of 2% lofat milk (again for health) 450 degrees 19 minutes, 350 for 14 minutes. Prewarmed eggs & milk, preheated pan and I did not open the door to the oven during the baking time. They were absoluly wonderful. Your recipe servived me making them with out cafinein my system and many changes to ingrdiants. I beleive this is a testamonial to a fool proof recipe. Thank you for getting me started. D.

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