Creating the Triple Nutella Mousse Cake involves several steps, each contributing to the dessert’s overall texture and flavor. Follow these instructions carefully for the best results:

1. Prepare Brownie Base

1. Preheat your oven to 350°F. Line a 9-inch springform pan with foil and spray lightly with nonstick spray.
2. In a saucepan over medium-low heat, melt Nutella and butter, stirring until smooth.
3. Remove from heat and whisk in sugar, eggs, and vanilla extract.
4. Sift in flour, cocoa powder, and salt; mix until combined.
5. Pour the batter into the prepared pan and bake for 25-30 minutes. Allow it to cool completely.

2. Make Mousse

1. Dissolve gelatin in cold water; let stand for 5 minutes.
2. Heat Nutella and ½ cup cream in a saucepan until melted. Remove from heat; stir in salt and gelatin until dissolved. Let cool.
3. Whip the remaining cream until soft peaks form. Fold into the cooled Nutella mixture.
4. Spoon the mousse over the cooled brownie base. Chill in the refrigerator for 2 hours.

3. Prepare Topping

1. Warm Nutella and cream until melted. Cool slightly, then pour over the mousse layer.
2. Smooth the top and refrigerate for at least 1 hour or until set.

4. Serve

1. Carefully remove the sides of the springform pan.
2. Garnish with whipped cream or fresh berries for an extra touch of elegance and flavor.