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Heat the oven to 350ºF.
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Generously butter a 2-quart glass or ceramic baking dish.
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Melt butter in a medium saucepan over medium heat.
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Whisk in the flour and cook - stirring constantly - for 2-3 min or until mixture is smooth and begins to turn a pale golden brown.
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Slowly whisk in the half and half.
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Cook, stirring constantly, for 2-3 more min or until the mixture begins to thicken and comes to a boil.
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Remove from the heat.
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Place the egg yolks in a large bowl, whisk lightly to break them up a little.
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Whisk in about 1/3 of the butter mixture into the egg yolks.
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Now, whisk the yolk mixture back into the remaining butter mixture.
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Cook and stir over medium low heat for 2-3 min or until the sauce thickens.
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Pour into the same large bowl and stir in the corn, green onions, thyme, salt and pepper.
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Cool slightly, about 5 minute.
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Place the egg whites in a medium bowl.
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Beat at medium high speed until firm but not stiff peaks form.
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Stir about 1/4 of the whites into the corn mixture.
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Gently fold in the remaining whites until combined.
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Spoon into the greased baking dish.
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Bake for 45-50 min or until pudding is puffed and golden brown with firm edges. The center will be wobbly but will not run like a liquid.
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Serve immediately - the pudding will sink (deflate) as it cools.