Carrot Sheet Cake with Buttercream Flowers and Brown Butter Cream Cheese Frosting
Carrot cake sheet cake that is perfectly moist, speckled with walnuts and fresh, grated carrots. Topped with brown butter cream cheese frosting.
Prep Time30 mins
Cook Time40 mins
Total Time1 hr 10 mins
Servings: 1 (9x13-inch) sheet cake
Carrot Cake Dry Mix:
- 2 1/2 cups all-purpose flour
- 2 teaspoons baking soda
- 2 teaspoons ground cinnamon
- 1 teaspoon freshly ground nutmeg if using dried nutmeg, use 1/2 teaspoon
- 1 teaspoon salt
- 1/2 teaspoon ground ginger
Carrot Cake Wet Mix:
- 1/2 cup unsalted butter at room temperature
- 1 cup white granulated sugar
- 1 cup brown sugar
- 1/2 cup vegetable oil
- 3 large eggs
- 3/4 cup buttermilk
- 2 1/2 cups grated carrots
- 1 1/2 cup chopped walnuts
Brown Butter Cream Cheese Frosting:
- 1/2 cup of unsalted butter at room temperature
- 8 ounces cream cheese at room temperature
- 1/2 teaspoon ground cinnamon
- 1/8 teaspoon ground cardamom
- 1 teaspoon pure vanilla extract
- Pinch of salt
- 3 cups powdered sugar
- 2 tablespoons heavy cream
Buttercream for Flowers
- 1 cup unsalted butter at room temperature
- 4 cups powdered sugar sifted
- Pinch of salt
- 1 tablespoons heavy cream
- Food gel coloring
To Make the Cake:
Preheat oven to 350 degrees F. Grease a 9x13-inch baking pan. I also like to line my baking pan with a parchment just to make sure nothing sticks.
In a medium bowl, whisk together the flour, baking soda, cinnamon, nutmeg, salt and ginger. Set the dry mixture aside.
In the bowl of a stand-up mixer, with the paddle attachment, add the butter, white sugar and brown sugar; beat until nice and fluffy, about 2 to 3 minutes. Pour in the oil and eggs. Beat until combined.
Alternating between the buttermilk and the dry mix, add them to the butter mixture, until just combined. Lastly, add the carrots and walnuts and mix until thoroughly distributed throughout the batter.
Pour the batter into the prepared cake pan and transfer to the oven to bake for 35 to 40 minutes, or until a skewer inserted into the center comes out clean.
Allow to cool in the pan for about 5 minutes and then transfer to a cooling rack to cool before adding the frosting.
To Make the Brown Butter Cream Cheese Frosting:
Cube up 1/2 cup of the butter (1 stick). In a small saucepan, set over medium heat, add the cubed butter. Once it’s melted, it will begin to foam up and bubble a bit. Allow it to cook until you begin to see lightly browned specks beginning to form. Give it a stir and cook until it’s browned. You should also start to smell its nutty aroma. Pour it in a freezer-safe bowl and stir to cool it down.
Transfer it to the freezer to chill, for about 5 minutes. We want it to be around room temperature butter. After it gets to that room temperature butter-firmness (it can be a bit softer—that’s ok), transfer it to the bowl of a stand-up mixer (or bowl using an electric mixer). Add the cream cheese and beat until smooth.
Sift in the powdered sugar and add the vanilla extract, salt and heavy cream. Beat the frosting for about 3 minutes. The fluffiness from the heavy cream really lightens up this frosting so be sure to beat it for the full 3 minutes. If the frosting is too loose, feel free to transfer it to the fridge to chill for about 10 minutes. Then beat it one last time.
To Make the Buttercream for the Flowers:
To Assemble the Cake:
Pour all of the frosting on the cooled sheet cake and spread it around, creating cute swoops as you go. Top it with whatever you like! I piped out buttercream roses, see below for notes! Cake will stay moist for about 3 days when wrapped properly.