INGREDIENTS
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cooking spray
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2-1/4 cup all-purpose flour
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1-1/2 cups granulated sugar
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3-1/2 teaspoons baking powder
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1 teaspoon salt
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1-1/4 cups milk
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vegetable oil
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8 Tablespoons butter, softened
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1 Tablespoon vanilla extract
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3 large eggs
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1-1/2 cups granulated sugar
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1/4 cup + 2 Tablespoons cornstarch; packed
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7 Tablespoons cocoa
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7 Tablespoons butter, divided
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3/4 teaspoon salt
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1 Tablespoon vanilla