Cost information for the following is not included. Normally this is because the quantity or ingredient is unknown
1 cup plus 2 tablespoons (2 & 1/4 sticks) unsalted butter, room temperature, plus more for tins
1 cup plus 2 tablespoons unsweetened Dutch-process cocoa powder, plus more for tins
2 & 1/2 cups plus 2 tablespoons all-purpose flour
1 cup packed dark-brown sugar
1 & 1/2 cups buttermilk
Pastry Cream (I used a small box of vanilla pudding, cooked variety)
Chocolate Ganache Glaze
1 & 1/4 teaspoons pure vanilla extract