INGREDIENTS
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For the Nutella Crunch layer: (optional but recommended)
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1/2 cup (3 1/2oz/ 100g) semisweet chocolate chips (or finely chopped chocolate)
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1 tablespoon (1/2 oz/ 14g) butter
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1/2 cup plus 1 tablespoon (5⅞ oz/ 167g) Nutella
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2 1/2 cups (7⅝oz/ 217g) Feuilletine (may be substituted with crispy rice cereal) *see note
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For the cake:
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1 (15.25oz/ 432g) box chocolate cake mix (Devil's Food, Chocolate Fudge or Dark Chocolate)
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1 cup (4.4oz/ 125g) all-purpose flour
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1 cup (7oz/ 199g) granulated sugar
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1/4 cup plus 2 tablespoons unsweetened cocoa powder
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3/4 teaspoon salt
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3 large eggs
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1 1/2 teaspoons vanilla extract
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1/2 cup vegetable or neutral tasting oil
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1 1/3 cups water
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1 cup (8oz/ 227g) sour cream
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For the Very Nutella Frosting (makes about 3 1/2 cups):* (see note above)
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1 cup (8oz/ 227g) unsalted butter, softened to room temperature
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1/2 cup (4oz/ 113g) cream cheese (or 8 Kiri squares), softened but slightly cool
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1 1/2 cups (1 lb/ 454g) Nutella
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1/2 cup plus 1 tablespoon (4oz/ 113.4g) semisweet chocolate chips
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1/2 cup plus 1 tablespoon (4 oz/ 113.4g) milk chocolate chips
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For the Nutella Sauce Filling:
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1 1/3 cups plus 1 tablespoon (15oz/ 425g) Nutella
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1/4 cup plus 3 tablespoons whole milk
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For the Spun Sugar garnish: (optional)
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1 cup (7oz/ 199g) granulated sugar
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2 tablespoons light corn syrup
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2 tablespoons water