Chocolate Panna Cotta Layer Cake

INGREDIENTS

• 1/3 cup vegetable oil
• 5 ounces bittersweet chocolate, chopped
• 2 1/2 cups heavy whipping cream
• 1/8 teaspoon salt
• 3 tablespoons unsweetened cocoa powder
• 5 ounces high-quality milk chocolate, such as Lindt or Perugina, chopped
• 3 large eggs
• 1/2 cup hot water
• 4 ounces bittersweet chocolate, chopped
• 2 1/2 cups whole milk
• 5 teaspoons unflavored gelatin
• 1/2 cup plus 2 tablespoons sugar
• 7 1/2 ounces bittersweet chocolate, chopped
• 1 1/4 teaspoons vanilla extract
• Nonstick vegetable oil spray
• 1/2 cup water
• 1/2 cup (packed) golden brown sugar
• 1 cup plus 1 tablespoon all purpose flour
• 1/2 cup sugar
• 1/2 cup hot coffee
• 1/2 teaspoon baking soda
• 1 teaspoon baking powder
• 1 1/4 vanilla beans, split lengthwise
• 1/2 cup sour cream