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Preheat your oven to 450 degrees with a popover pan on rack in the lowest position. Have your flour and salt already measured out and ready to go.
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Combine eggs, milk and vanilla in a large bowl. Whisk together until very frothy. (This should only take about a minute.) Add flour, salt and one tablespoon sugar to the egg mixture.
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Whisk until batter is the consistency of heavy cream. You will see lots of tiny air bubbles, those are what will cause the popovers to rise. :)
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Remover your popover pan from the oven and coat with cooking spray. (If using a standard muffin tin, only coat (and fill) the outer cups; they get better circulation in the oven. Also, reduce baking times by 5 minutes. )
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Fill the popover cups about 3/4 full with batter. Bake for 20 minutes then reduce oven temperature to 350 degrees. Bake until golden brown about 20 minutes more.
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Combine 1/4 cup sugar with cinnamon in a small bowl. Brush the top of each baked popover with melted butter and then dip them in the cinnamon sugar.