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1
Preheat oven to 350 degrees Fahrenheit.
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2
Melt 125 grams of dark chocolate with 60 milliliters of water and set aside.
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3
In a medium-sized bowl, mix together the flour, unsweetened cocoa powder, baking powder, baking soda, and a pinch of salt.
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4
In another bowl, beat 125 grams of softened butter, the granulated sugar, and dark brown sugar until the mixture is pale.
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5
Add eggs, one at a time, while continuing to whisk.
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6
Alternate adding the flour mixture and the buttermilk to the above mixture, and mix.
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7
Finally, add the melted chocolate.
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8
Divide the batter into two buttered and flour cake pans, then bake for approximately 35 minutes.
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9
In a double boiler, melt 125 grams of dark chocolate then set aside to cool completely.
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10
In a bowl, whisk 227 grams of softened butter with powdered sugar on low speed for about 1 minute.
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11
Add vanilla extract and beat again on low speed until everything is well blended.
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12
Add the melted chocolate to the butter mixture and beat at medium speed until everything is smooth.
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13
Add Nutella and milk. Beat on medium-high speed for another minute.
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14
Once the cakes cool down, assemble by layer the cake and the frosting.
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15
Make sure to frost your cake in several increments, placing it in the refrigerator between each layer.
