Flower Cupcakes

Deselect All

18 tablespoons (2 1/4 sticks) unsalted butter, at room temperature

3 cups sugar

6 extra-large eggs, at room temperature

1 cup sour cream, at room temperature

1 1/2 teaspoons pure vanilla extract

3 cups all-purpose flour

1/3 cup cornstarch

1 teaspoon kosher salt

1 teaspoon baking soda

For the icing:

3/4 pound (3 sticks) unsalted butter, at room temperature

1 pound cream cheese, at room temperature

3/4 pound confectioners' sugar, sifted

1 1/4 teaspoons pure vanilla extract