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Preheat oven to 350 degrees.
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Lightly grease and flour 10 inch Bundt pan(I use Baker's Joy spray).
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In a small bowl whisk together 2/3 cup Nutella and 1 egg.
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Blend until completely smooth and set aside.
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In a large bowl using an electric mixer on low, stir together cake mix, 3 remaining eggs, buttermilk, and remaining 1/3 cup Nutella until moistened.
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Scrape down sides and increase speed to medium for 3 minutes more.
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Remove 1 cup batter and mix into nutella/egg mixture.
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Pour batter from large bowl into Bundt pan.
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Spoon nutella batter over it and using a knife, gently swirl batters together to create a marble pattern.
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Smooth top of cake batter.
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Bake for 40-50 minutes or until toothpick inserted into cake has moist crumbs that stick to it.
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Cool cake in pan for 15 minutes.
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Carefully invert onto cooling rack and remove pan.
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While cake cools, make glaze.
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GLAZE:.
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Whisk together confectioners sugar and Frangelico liquor until smooth.
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Drizzle over cake.