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For Cake:.
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Preheat oven to 350.
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Stir first 5 ingredients directly into an ungreased 9X13 cake pan.
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In a bowl, stir together water, vinegar, and vanilla; pour over dry ingredients.
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Pour oil over all.
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Using a fork, stir until mixture is a uniform color and has no lumps.
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Bake 30-35 minutes or until a toothpick inserted in center comes out clean.
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Cool COMPLETELY in pan then frost with icing #1 and drizzle icing #2 over that.
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Icing #1.
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Whisk together flour and milk in a small saucepan over medium-high heat; cook, whisking constantly, until mixture has thickened.
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Remove from heat and cool to room temperature.
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Beat butter and sugar together until light and fluffy.
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Add flour mixture and beat until icing is fluffy and sugar is dissolved.
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Icing #2.
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Needs to be scaled way down because if you use it all it makes a big soupy mess on top of the cake so I always throw MOST of this away!
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Combine first 5 ingredients in a saucepan over medium heat until butter melts, stirring well.
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Increase heat to medium-high and bring to a boil; cook 1 minute, without stirring.
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Remove from heat and stir in vanilla.
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Beat until thick.
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I always use one of those squirt bottles you can get anywhere for this step; pour into squirt bottle and drizzle as much as you want on top of cake over icing #1.