Simple Birthday Cake with Marshmallow Frosting

Ingredients

• 1 teaspoon vanilla extract
• 1 tablespoon light corn syrup
• 2 egg whites, room temperature
• 1 ¹/₃ cups granulated sugar
• ¼ teaspoon cream of tartar
• 5 tablespoons cool water, plus more for the double boiler
• 1 ½ cups coarsely chopped semisweet chocolate
• + 9 more ingredients
• • 2 cups sour cream
  • 2 teaspoons vanilla extract
  • 1 ¹/₃ cups granulated sugar
  • 2 eggs
  • 2 ½ cups all-purpose flour
  • 1 ½ teaspoons baking powder
  • 1 teaspoon kosher salt
  • ½ teaspoon baking soda
  • 10 tablespoons unsalted butter, plus additional for cake pans

Special equipment: 2 (8 by 2-inch) round cake pans and an instant-read thermometerCake: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 ...

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