Ingredients:
- Cupcakes:
- 8 ounces cake flour (about 2 cups)
- 1/2 teaspoon salt
- 1/2 teaspoon baking soda
- 1/2 teaspoon baking powder
- 1/2 cup butter, softened
- 1 1/4 cups sugar
- 2 large egg yolks
- 1 teaspoon vanilla extract
- 1 cup whole buttermilk
- 3 large egg whites
- 1/4 teaspoon cream of tartar
- Baking spray with flour
- Frosting:
- 1 cup sugar
- 1/4 cup water
- 1/2 vanilla bean
- 3 large egg whites
- 1/4 teaspoon cream of tartar
- 1/8 teaspoon salt
- 1/4 cup butter, softened (optional)