INGREDIENTS
1
Egg, large
1 cup
Nutella
3/4 cup
All-purpose flour
3/4 tsp
Baking powder
3/4 tsp
Baking soda
1/4 cup
Cocoa powder, unsweetened
3/4 cup
Dark chocolate
1 cup
Granulated sugar
6 cups
Powdered sugar
1/2 tsp
Sea salt, fine-grain
1 tbsp
Vanilla extract
1/4 cup
Sunflower oil
4 tbsp
Hazelnuts, roasted
12 oz
Butter, unsalted
1/2 cup
Sour cream
3 tbsp
Whipping cream
1/3 cup
Whole milk
1/2 cup
Water