TRIPLE NUTELLA MOUSSE CAKE

This triple Nutella mousse cake features a rich Nutella brownie base topped with a layer of luscious Nutella mousse filling and a layer of soft Nutella ganache.
How to make triple Nutella mousse cake?
Begin by making the brownie layer. Line the bottom of a 9-inch springform pan with foil so the cake is easy to lift off the base of the pan. You could also use parchment paper but I worry about batter leaking from the bottom seal.

Spray the foil and sides of the pan with non-stick spray and press a strip of parchment paper around the inner ring. The nonstick spray will help the parchment paper stay in place.

Prepare the brownie batter then spread it evenly into the bottom of the pan and bake it for 25-30 minutes. Times may vary depending on your oven. Test the brownie with a toothpick and remove it once you get just a few moist crumbs attached to the toothpick.
Cool the brownie completely by letting sit at room temperature for an hour or refrigerate it for about 20 minutes.

Once the brownie base is completely cool, you can make the mousse layer and spread it over the brownie layer. Refrigerate the mousse layered brownie for at least 2 hours.

After the mousse layer has set, make the ganache topping and spread it evenly over the top. Return the cake to the refrigerator and chill for about 1 hour to allow the ganache to set.
Remove the sides of the pan and carefully pull the parchment paper off the sides of the cake. Transfer the cake to a serving platter and enjoy!

INGREDIENTS
For the brownie base
▢8 ounces (226 g) Nutella
▢½ cup (113 g) unsalted butter, cut into pieces
▢¾ cup (150 g) granulated sugar
▢3 large eggs, room temperature
▢1 tablespoon pure vanilla extract
▢1 cup (130 g) all-purpose flour
▢3 tablespoons Dutch-process cocoa powder
▢½ teaspoon salt
For the mousse layer
▢2 ¼ teaspoons plain gelatin powder, 1 packet
▢4 tablespoons cold water
▢8 ounces (226 g) Nutella
▢1 ½ cups (360 ml) heavy cream, divided
▢⅛ teaspoons salt
For the topping
▢1 cup (300 g) Nutella
▢½ cup (120 ml) heavy cream
INSTRUCTIONS
Make the base
Preheat the oven to 350ºF. Line the bottom a 9-inch springform pan with aluminum foil and spray the foil lightly with nonstick spray. Line the sides of the pan with parchment paper.
Add the Nutella and butter to a medium saucepan. Warm over medium-low heat, stirring constantly until Nutella is melty and smooth. Whisk in the sugar. Set aside to cool slightly.
Once cooled, whisk in the eggs and vanilla until combined. Sift the flour, cocoa powder, and salt into the Nutella mixture and fold together with a rubber spatula just until combined.
Spread the batter evenly into the bottom of the prepared pan. Bake for 25 to 30 minutes, or until a toothpick inserted into the center comes out with only a few moist crumbs. Leave the brownie in the pan and set it wire rack to cool completely. Or pop it in the refrigerator for 15-20 minutes.
Make the mousse
In a small bowl, sprinkle the gelatin over water, let stand for 5 minutes.
Bring the Nutella and ½ cup of the cream to a simmer in a small saucepan over medium-high heat, whisking until the Nutella has fully melted. Remove from heat.
Add the salt and softened gelatin; whisk until gelatin is fully dissolved. Transfer to a large bowl and cool to room temperature, stirring occasionally. The mixture will thicken slightly.
In the bowl of a stand mixer fitted with the whisk attachment, whip the remaining 1 cup cream at medium speed until it begins to thicken, about 30 seconds. Increase the speed to high and whip until soft peaks form, about 30 to 60 seconds.
Use a whisk to mix in ⅓ of the whipped cream into the Nutella mixture. Use a rubber spatula to fold in the remaining whipped cream until no streaks appear.
Spoon the mousse into the pan over the brownie layer. Smooth the top with an offset spatula. Place the cake in the refrigerator and chill until set, about 2 hours.
Make the topping
Warm the Nutella and cream in a small saucepan over medium-low heat, whisking until the Nutella has fully melted. Set aside to cool for 10 minutes, stir it occasionally.
Pour the glaze over the top of the mousse layer and use an offset spatula to smooth it over. Refrigerate for at least 1 hour or until the glaze has set.
Carefully remove the sides of the pan and dispose of the parchment paper. Serve the cake with whipped cream or fresh berries.
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