"Perfect Texas Sheet Cake with a smooth, glossy, fool-proof frosting..."
INGREDIENTS
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2 cups all-purpose flour (9 oz)
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2 cups minus a tablespoon of granulated sugar
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1/2 teaspoon salt
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1/2 teaspoon cinnamon (optional)
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2 sticks unsalted butter (8 oz)
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1/3 cup unsweetened natural (not Dutch) cocoa powder
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1 cup water
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2 large eggs
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1/2 teaspoon vanilla
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1/2 cup buttermilk
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1 teaspoon baking soda
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1 pound (3.8 cups) confectioners' sugar
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1 stick (4 oz) unsalted butter
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1/4 scant teaspoon salt -- omit if using salted butter
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4 tablespoons unsweetened natural cocoa powder
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7 tablespoons milk
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1 teaspoon vanilla extract