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Simple Birthday Cake with Marshmallow Frosting

Recipe courtesy of Alex Guarnaschelli

Watch how to make this recipe.

Simple Birthday Cake with Marshmallow Frosting

Name: Simple Birthday Cake with Marshmallow Frosting
Prep time: P0Y0M0DT0H25M0.000S
Cook time: P0Y0M0DT0H45M0.000S
Total time: P0Y0M0DT1H55M0.000S
Yield: 8 servings
Ingredients: 10 tablespoons unsalted butter, plus additional for cake pans; 1/2 teaspoon baking soda; 1 teaspoon kosher salt; 1 1/2 teaspoons baking powder; 2 1/2 cups all-purpose flour; 2 eggs; 1 1/3 cups granulated sugar; 2 teaspoons vanilla extract; 2 cups sour cream; 1 1/2 cups coarsely chopped semisweet chocolate; 5 tablespoons cool water, plus more for the double boiler; 1/4 teaspoon cream of tartar; 1 1/3 cups granulated sugar; 2 egg whites, room temperature; 1 tablespoon light corn syrup; 1 teaspoon vanilla extract

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Level: Intermediate
Total: 1 hr 55 min

Prep: 25 min
Inactive: 45 min
Cook: 45 min

Yield: 8 servings

Nutrition Info

Level: Intermediate
Total: 1 hr 55 min

Prep: 25 min
Inactive: 45 min
Cook: 45 min

Yield: 8 servings
Nutrition Info

Ingredients

10 tablespoons unsalted butter, plus additional for cake pans

1/2 teaspoon baking soda

1 teaspoon kosher salt

1 1/2 teaspoons baking powder

2 1/2 cups all-purpose flour

2 eggs

1 1/3 cups granulated sugar

2 teaspoons vanilla extract

2 cups sour cream

1 1/2 cups coarsely chopped semisweet chocolate

"Marshmallowy" Frosting:

5 tablespoons cool water, plus more for the double boiler

1/4 teaspoon cream of tartar

1 1/3 cups granulated sugar

2 egg whites, room temperature

1 tablespoon light corn syrup

1 teaspoon vanilla extract

Directions

Watch how to make this recipe.

Special equipment:

2 (8 by 2-inch) round cake pans and an instant-read thermometer

Cake:
Preheat the oven to 350 degrees F.
Liberally butter the bottom and sides of 2 cake pans. Put a round of parchment paper into the bottom of each pan and coat them with butter. Put the pans on a baking sheet.
Melt the 10 tablespoons of butter in a small pot over low heat. Remove the pot from the stove and allow it to cool slightly. Reserve.
In a medium bowl, sift together the baking soda, salt, baking powder and flour.
In a large bowl, beat the eggs, sugar, vanilla, and sour cream together until smooth. Add the flour mixture in small batches to the wet ingredients, whisking as you go to avoid the formation of lumps. Make a well in the center of the batter and pour in the melted butter. Whisk until smooth. Fold in the chopped chocolate
Divide the batter between the cake pans and spread out to level the top. Gently tap the sides of the pan so the batter distributes evenly. Slide the baking sheet into the center of the oven and bake until a toothpick inserted in the center comes out clean, 40 to 45 minutes. Remove the pans from the oven and allow the cakes to cool briefly. Invert the cakes from the pans onto a baking sheet fitted with a wire rack and peel off the parchment paper. Allow them to cool for at least 45 minutes before frosting.
Frosting:
Pour some water, about 2 inches deep, into a saucepan to create a makeshift double boiler. Put the pan on the stove and bring the water to a gentle simmer. Dip the instant-read thermometer into the simmering water to clean any impurities off the end and to test that the thermometer works.
In a clean, large mixing bowl, combine the 5 tablespoons of cool water, cream of tartar, sugar, egg whites and corn syrup. Gently lower the bowl over the simmering water. Turn off the heat under the pot. Use an electric hand beater to whip the whites over the water. Do not leave the egg white mixture unattended or stop beating any time during this process.
After about 3 minutes, remove the bowl from the heat, set the beater down and quickly take the temperature of the egg whites. You want them to reach 140 degrees F. If you measure the temperature before they reach that point, immediately put the bowl of whites back over the water and resume beating until they are finished, an additional 2 to 3 minutes.
Remove the bowl from the water and fold in the vanilla extract. It should look like marshmallow fluffiness. Set the frosting aside to allow the mixture to cool. Frost the cake by, as my father used to say, "glopping" the frosting all over the top and the sides. Serve immediately.

Simple Birthday Cake with Marshmallow Frosting

"Marshmallowy" Frosting:

Special equipment:

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