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1
Preheat oven to 350 degrees.
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2
To Make Cake:
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Cream butter, sugar, eggs, and vanilla in medium bowl until light and fluffy.
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Combing dry ingredients.
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Add alternately with milk to creamed mixture.
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Pour batter into well-greased and floured 9-inch layer pan.
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Bake 30 to 35 minutes or until cake tester inserted in center comes out clean.
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Cool 10 minutes; remove from pan.
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Cool completely on rack.
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To Make Filling:
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Combine sugar, cornstarch, milk, and egg yolks in saucepan.
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Cook and stir over medium heat until mixture boils; boil and stir 1 minute.
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Remove from heat; blend in butter and vanilla. Cover and cool completely.
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To Make Glaze:
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While the cake and the filling can (and should) be made ahead of time, the glaze cannot be made until you're ready to assemble the pie.
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Bring water and butter to a full boil in a small saucepan. Remove from heat and stir in cocoa immediately. Then, beat in the confectioners' sugar and vanilla until the mixture is smooth. Cool slightly.
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Assembling the pie:
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Cut the cake into 2 thin layers.
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Spread filling onto one layer. Top with remaining layer.
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Pour glaze on top; let some drizzle down sides. Chill again before serving.