INGREDIENTS
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12 tablespoons (6 ounces, or 170 grams) unsalted butter, softened
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½ cup (4 ounces, 113 grams) vegetable oil
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14 ounces (397 grams) granulated sugar-2 cups
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3 large eggs
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1 cup (237 milliliters) buttermilk
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½ cup (119 milliliters) sour cream
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1 tablespoon (15 milliliters) vinegar
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1 tablespoon (15 milliliters) vanilla
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6 ounces (170 grams) all-purpose flour-1 ¼ cups
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5 ½ ounces (156 grams) cake flour- 1 ¼ cups* (see end of recipe for substitute)
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1 ½ teaspoons (7 ½ milliliters) baking soda
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¾ teaspoon (3 ¾ milliliters) salt
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5 ounces (142 grams) granulated sugar-3/4 cup
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2 tablespoons (30 milliliters) all-purpose flour
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Pinch of salt
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3 large eggs
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2 (8 ounce, or 227 gram) packages cream cheese, softened
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½ tablespoon (7 ½ milliliters) vanilla extract
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2 tablespoons (30 milliliters) sour cream
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7 ounces (198 grams) large marshmallows
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5 ounces (142 grams) corn syrup
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3 ounces (85 grams) granulated sugar
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1 teaspoon (5 milliliters) water
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2 cups (16 ounces or 454 grams) unsalted butter, softened
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¼ cup (60 milliliters) cold pasteurized egg whites
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1 cup confectioner’s sugar (4 ounces or 114 grams) or to taste up to 3 cups
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1 tablespoons (15 milliliters) vanilla extract
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½ tablespoon (7 ½ milliliters) vanilla bean paste or more vanilla extract