Triple Chocolate Mousse Cake

Ingredients (18)

• FOR THE CHOCOLATE SHORTBREAD CRUST:
• 1 1/2 cup all-purpose flour
• 3 tbsp unsweetened cocoa powder
• 1/4 cup granulated sugar
• 1/4 tsp Kosher salt
• 1 1/2 stick unsalted butter, chilled
• 1 egg
• 3/4 tsp vanilla extract
• FOR THE CHOCOLATE MOUSSE:
• 1 tsp unflavored gelatin
• 1/2 cup chocolate hazelnut spread
• 1/2 cup mascarpone cheese
• 1 1/2 cups heavy cream
• 2 tbsp unsweetened cocoa powder
• 3 tbsp granulated sugar
• FOR THE GANACHE:
• 1/5 cup heavy cream, plus 1 tbsp
• 7 oz quality bittersweet chocolate (not unsweetened)