INGREDIENTS
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Cake: 1/2 cup (1 stick) unsalted butter, melted and cooled, plus more for baking pan
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3 1/2 cups all-purpose flour, plus more for baking pan
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2 1/4 teaspoons baking powder
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1 1/4 teaspoons kosher salt
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1/2 teaspoon baking soda
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4 large eggs
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2 cups sugar
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1/2 cup vegetable oil
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1 tablespoon pure vanilla extract
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1 1/2 cups whole milk Frosting: 1 1/2 cups semisweet chocolate chips
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3/4 cup milk chocolate chips
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1 1/2 cups heavy cream
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1/4 teaspoon kosher salt
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2 teaspoons pure vanilla extract