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Beat egg whites until soft peaks form.
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Gradually add 1/2 cup sugar, beating until very stiff peaks form.
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Sift together remaining dry ingredients into another bowl.
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Add oil, half the milk and vanilla.
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Beat 1 minute at medium speed.
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Add remaining milk and egg yolks.
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Beat 1 minute, scrape bowl.
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Gently fold in egg whites.
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Bake in two greased 9x 1.5-inch round pans in 350°F oven for 25 minutes.
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Cool 10 minutes and then remove from pans.
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Cool completely.
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Fill with cream filling.
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Frost with Chocolate Glaze.
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French Custard Filling: In saucepan, combine sugar, flour, cornstarch and salt. Gradually stir in milk.
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Cook and stir until mixture thickens and boils; cook and stir 2-3 minutes longer.
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Stir a little of hot mixture into egg yolk; return to hot mixture.
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Cook and stir until mixture just boils.
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Add vanilla; cool.
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Beat until smooth; fold in whipped cream.
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Chocolate Glaze: Melt chocolate and butter over low heat, stirring constantly.
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Remove from heat. Stir in confectioners' sugar and vanilla until crumbly.
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Blend in 3 tablespoons boiling water.
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Add enough water (about 2 teaspoons), a teaspoon at a time, to form medium glaze of pouring consistency.
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Pour quickly over top of cake; spread glaze evenly over top and sides.