INGREDIENTS
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For the Cake
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4 tablespoons butter
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2 teaspoons pure vanilla extract
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1/3 cup all-purpose flour
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1/3 cup unsweetened cocoa powder
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4 large eggs
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2/3 cup sugar
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For the Mousse
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10 ounces hazelnut-flavored milk chocolate, chopped (you can also use regular chocolate chips)
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1-1/4 cups chilled heavy whipping cream
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1/8 teaspoon salt
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3 tablespoons water
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Hazelnut-flavored liqueur, such as Frangelico
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For the Whipped Vanilla Frosting
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1 cup cold heavy whipping cream
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1 teaspoon pure vanilla extract
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1 tablespoon sugar