"It’s the best...."
INGREDIENTS
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8 tablespoons (1 stick) unsalted butter
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3 large eggs
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2 large egg yolks
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1/2 cup whole milk
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1/3 cup sour cream
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Cooking spray
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2 3/4 cups all-purpose flour, plus more for dusting
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2 teaspoons baking powder
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2 cups granulated sugar
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1/2 teaspoon kosher salt
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2/3 cup vegetable or canola oil
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1 tablespoon vanilla extract
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2 sticks (8 ounces) unsalted butter, divided
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1/4 cup unsweetened cocoa powder
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2 ounces 70% dark chocolate, or 1/3 cup dark chocolate chips
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1/4 cup whole milk
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1 teaspoon vanilla extract
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1/4 teaspoon kosher salt
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1 pound powdered sugar (3 1/2 to 4 cups)
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1 tablespoon rainbow sprinkles, for decorating (optional)