INGREDIENTS
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2 sticks (1 cup or 8 ounces) unsalted butter
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1 1/3 cups 60% cacao bittersweet chocolate chips (I used Hershey’s Special Dark)
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4 large eggs
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2 cups granulated sugar
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1/4 teaspoon salt
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1 1/2 teaspoons pure vanilla extract
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1/4 cup + 1 tablespoon cake flour
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1/4 cup + 2 tablespoons unsweetened cocoa powder (Dutch process or regular or Special Dark)
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15 Oreo Cookies (or, if you can find them, use the White Fudge Covered Oreos)
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For the Fluffy White Frosting:
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8 tablespoons vegetable shortening (Crisco)
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1 stick (1/4 cup or 4 ounces) unsalted butter, softened
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1 cup marshmallow creme (such as Fluff)
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1 teaspoon pure vanilla extract
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1 teaspoon vanilla bean paste (or another 2 teaspoons pure vanilla extract)
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1 1/4 cups powdered sugar
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Topping:
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About 1 1/4 cups (or more) Oreo Mini Cookies
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2 tablespoons unsalted butter
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2 tablespoons light corn syrup
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1/2 cup semisweet chocolate chips
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2 teaspoons very hot water