Chocolate-Hazelnut Layer Cake

Ingredients

• baking spray
• 1 3/4 cups all-purpose flour
• 1 cup packed dark brown sugar
• 1 cup sugar
• 1 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 2 large eggs, at room temperature
• 1 cup sour cream, at room temperature
• 1/2 cup vegetable oil
• 1 tablespoon pure vanilla extract
• 1/4 cup hazelnut liqueur
• 3/4 cup boiling water
• 2 teaspoons instant espresso powder
• 4 ounces bittersweet chocolate (60% cacao), finely chopped
• 1 1/2 cups heavy cream
• 1/4 cup hazelnut liqueur
• 1/2 cup confectioners’ sugar
• 12 ounces bittersweet chocolate (60% cacao), finely chopped
• 8 ounces cream cheese, at room temperature
• 1 cup nutella
• 1 cup toasted and skinned hazelnuts, chopped
• 1 cup toasted and skinned hazelnuts
• 1/4 cup hazelnut liqueur
• 2 tablespoons confectioners’ sugar