Preheat the oven to 360°F/180°C.
Add the Nutella in a large bowl. Mix it with 1 egg, and add the flour. Whisk well until the flour is incorporated in the Nutella. Break the dark chocolate in small bits and add it in the mixture.
Pinch off a piece of the chocolate mixture and gently roll between your hands to form 1 1/2-inch balls. Continue shaping until all the mixture is used.
Line a baking tray with parchment paper and add the chocolate balls. Slide the tray into the oven for the next 15 minutes.
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