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Brownie Cake with Nutella Peanut Butter Frosting

This fool-proof, fail-safe, crowd-pleasing, deep-chocolate brownie cake is topped with fluffy Nutella and peanut butter frosting and then sprinkled with Maldon Sea Salt flakes.
Author Rebecca Lindamood

Ingredients

For the Brownie Cake:

  • 4 ounces 4, 1oz squares unsweetened baker's chocolate, chopped
  • 2 sticks 8 ounces or 16 tablespoons butter
  • 2 cups raw sugar can substitute granulated white sugar if necessary
  • 4 large eggs
  • 1 cup 4 1/4 ounces by weight all-purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon kosher salt
  • 1 teaspoon pure vanilla extract

For the Nutella Peanut Butter Frosting:

  • 1 stick 4 ounces or 8 tablespoons butter, softened to room temperature
  • 1/3 cup Nutella
  • 2 tablespoons creamy peanut butter
  • 1 pound 4 cups powdered sugar
  • 2-4 tablespoons whole milk or heavy cream
  • 1 teaspoon pure vanilla extract

For Serving:

  • Maldon Sea Salt Flakes

Instructions

To Make the Brownie Cake:

  • Preheat the oven to 350°F. Line a 9"x13" baking pan with foil and spray lightly with non-stick cooking spray. Set aside.
  • Unwrap and add the 2 sticks of butter and the chopped chocolate to a small, heavy-bottomed saucepan. Place the pan over very low heat and stir until the butter is melted and the chocolate is almost completely melted. Remove from the heat and stir until the chocolate is completely melted and the mixture is smooth. Pour into the bowl of a stand mixer fitted with a batter blade (or a mixing bowl in which you can use an electric hand mixer.) Add the sugar and mix on medium until combined.
  • Add the eggs, one at a time, mixing well after each addition.
  • In a separate bowl, quickly whisk together the flour, baking powder and salt. Add it to the mixer all at once and mix on low just until combined and there are no more dry pockets. Pour the brownie batter into the prepared pan and tap the pan on the counter two or three times to even it out.
  • Bake for 20-25 minutes or just until the center is set. Do not overbake! Remove the pan from the oven and let the brownies cool completely in the pan.
  • Use the foil to help you transfer the brownie cake from the pan to a cutting board. Carefully pull the foil from under the brownie cake.

To Make the Nutella Peanut Butter Frosting:

  • In the bowl of a stand mixer fitted with the whisk attachment, blend the softened butter, Nutella, and peanut butter on high until fluffy. Add the powdered sugar and start and stop the blender a couple of times to prevent a POOF of powdered sugar from flying into the air. Once you're sure you're in the clear, turn the mixer to high and blend until it is even. Pour 2 of the tablespoons of milk or cream and the vanilla extract while the mixer is running. Stop the mixer, scrape down the sides of the bowl. Mix on high again until smooth and fluffy, adding some of the additional milk if necessary.
  • Frost the cooled brownie cake. Cut into squares and sprinkle with Maldon Sea Salt Flakes -grinding them between your fingers over the frosting- just before serving.