Easy Banana Cake with Nutella Frosting made in just 20 minutes. 13 ingredients, intense banana flavor, soft and moist, super creamy best ever Nutella Frosting.
Preheat oven to 350°F (175°C). Line the bottom of two 9" (23cm) spring pans with parchment paper. Set aside.
Make the cake: In a large mixing bowl, using a handheld or stand mixer fitted with a paddle attachment, stir eggs, brown sugar, oil, and mashed bananas on medium speed until smooth and well combined for about 2 minutes. Stir in flour, baking powder, salt, and vanilla* just to combine. Pour the batter into the two prepared spring pans equally. Bake for about 25-30 minutes or until a toothpick centered in the middle comes out clean. Let cool to room temperature.
Meanwhile, make the frosting: Whisk butter in a large mixing bowl on medium speed until creamy. Add Nutella and stir until smooth and combined. Mix in sifted powdered sugar and salt to combine. Add heavy whipping cream and stir until creamy and smooth.
Spread about 1/2 of the frosting all over the bottom layer, place top layer on top, and spread the remaining frosting on top and around the edges. Top with whipped cream and chopped hazelnuts if desired (highly recommended). Let chill in the fridge until frosting is firm for about 1-2 hours. Store leftovers in an airtight container in the fridge up to 2 days.
*First, cut off the straight end of the vanilla bean. Then place the tip of your sharp knife below the curled end and cut the vanilla bean through the middle of the bean lengthwise. Although you don't need to cut it all the way through, it's ok when you do so. Then open the vanilla bean and scrape out the flavorful seeds with the back of your knife. Then just use the seeds.