Prepare the ingredients: In a bowl, combine the almond flour, powdered sugar, and finely ground toasted hazelnuts. In a separate bowl, whisk the egg whites until stiff peaks form. Gradually add the granulated sugar, whisking until you achieve a glossy, stable meringue.
Gently fold the almond flour-hazelnut mixture into the meringue, ensuring the batter is homogenous and smooth. Be careful not to overmix, as this can prevent the macarons from rising properly.
Using a piping bag, pipe evenly sized circles onto a baking sheet lined with parchment paper. Let them rest for 30 minutes to allow a skin to form on the surface.
Bake in a preheated oven at 300°F (150°C) for 12-15 minutes, or until the macarons are slightly crisp on the outside and still soft inside.
For the filling, heat the heavy cream in a saucepan over medium heat. Pour the hot cream over the finely chopped dark chocolate. Let it sit for a minute, then stir until the chocolate is completely melted and smooth. Stir in the Nutella until fully incorporated, creating a creamy and smooth ganache.
Let the ganache cool slightly to thicken, then use a spoon or piping bag to fill one half of each macaron shell. Top with the other shell to create a sandwich.
Place the assembled macarons on a platter and refrigerate for at least 2 hours to allow the flavors to meld and the filling to set completely.
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