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1
For the best chocolate sheet cake: Preheat the oven to 350 degrees F. Use an 18-by-13-inch sheet Cut parchment paper to fit the pan and spray each side with baking spray.
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2
In a mixing bowl, combine the flour, granulated sugar and salt. In a saucepan, melt the butter. Add the cocoa to the butter and stir together. Add 1 cup boiling water to the pan and then allow the mixture to boil for 30 seconds. Pour over the flour mixture, and stir lightly to cool.
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3
Pour the buttermilk into a bowl and add the baking soda, vanilla and beaten eggs. Stir the buttermilk mixture into the butter/flour mixture. Pour into the prepared cake pan and bake for 20 minutes. Let the cake cool completely.
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4
Cut the cooled cake into circles with a 2 1/2-inch biscuit cutter, and then lay the circles on another sheet pan with a wire rack; set this pan in the fridge to make sure there is no warmth to the cake at all. (The frosting is so light and fluffy, the coolness will help keep it all together.)
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5
For the white frosting: In a small saucepan, whisk the flour into the milk and heat, stirring constantly, until it thickens. You want it to be very thick--thicker than cake mix, more like a brownie mix. Remove from the heat and let cool to room temperature. If in a hurry, place the saucepan over ice in the sink for about 10 minutes or so until the mixture cools. It must be completely cool before you use it in the next step. Stir in the vanilla.
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6
While the mixture is cooling, cream the butter and granulated sugar together until light and fluffy. You don't want any sugar graininess left. Then add the completely cooled milk/flour mixture and beat the living daylights out of it. If it looks separated, you haven't beaten it enough! Beat it until it all combines and resembles whipped cream. Grab a spoon and taste this wonderful goodness. If there is any left after your taste test, spread it on a cooled
