INGREDIENTS
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1 (level) cup unsweetened cocoa powder divided; 3/4 cup for brownies, 1/4 cup for frosting
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1 cup unsalted butter, divided; 3/4 cup for brownies, 1/4 cup for frosting
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2 cups granulated sugar
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3 large eggs, lightly beaten
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3 teaspoons vanilla extract, divided; 2 teaspoons for brownies, 1 teaspoon for frosting
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1 cup all-purpose flour
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3 tablespoons milk
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1 teaspoon white vinegar
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2-3 cups powdered sugar
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1/2 teaspoon salt