INGREDIENTS
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3/4 cup (1 1/2 sticks) unsalted butter, cut into pieces
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1/2 cup root beer, flat
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1/3 cup unsweetened Dutch-processed cocoa
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1 1/4 cups all-purpose flour
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1 1/4 cups sugar
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1/4 teaspoon fine salt
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1/4 cup sour cream
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2 large eggs, room temperature
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1 teaspoon pure vanilla extract
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8 large egg whites
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1 1/2 cups granulated sugar
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1/2 teaspoon cream of tartar
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1 pinch fine salt
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1 teaspoon banana extract, or more to taste
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1 to 2 drops pastel food coloring, optional
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Candied eyeballs