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Heat oven to 425* F.
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Either melt butter in an oven-proof skillet and remove from heat OR melt it in a regular saucepan and pour into a prepared (liberally buttered) pie pan.
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In a blender, combine the eggs and milk and whirl until foamy and pale.
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Add to the blender the vanilla, flour, sugar and salt.
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Whirl until fully blended.
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Pour batter into the melted butter--it will look like a dish of white soup with slicks of oil on top (not appetizing at all, I know).
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Bake in the oven about 18 minutes or until golden brown and puffy.
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Slice when the "puff" has deflated and serve with jam or sugar.