Ingredients

1 cup plus 2 tablespoons sifted cake flour
2/3 cup sugar
1 1/2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup milk
1/4 cup cooking oil
2 egg yolks
1 teaspoon vanilla
2 egg whites
1/4 teaspoon cream of tartar
Pastry cream, recipe follows
Ganache, recipe follows

Pastry Cream Filling:

2 cups whole, 2 percent fat, or 1 percent fat milk
1/2 vanilla bean, split lengthwise, seeds scraped out
6 egg yolks
2/3 cup granulated sugar
1/4 cup cornstarch
1 tablespoon unsalted butter

Ganache:

8 ounces semisweet chocolate
1 cup heavy cream, boiling