Triple Chocolate Mousse Cake Decadence Defined

Ingredients

• 1 cup (225g) all-purpose flour (plus extra for dusting the pan)
• 1/2 cup (50g) unsweetened cocoa powder
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup (200g) granulated sugar
• 1/2 cup (120ml) vegetable oil
• 1 large egg
• 1 teaspoon vanilla extract
• 1 cup (240ml) boiling water
• 8 ounces (225g) dark chocolate (70% cacao or higher), finely chopped
• 1 1/2 cups (360ml) heavy cream, divided
• 2 large egg yolks
• 2 tablespoons granulated sugar
• 8 ounces (225g) white chocolate, finely chopped
• 4 ounces (115g) semi-sweet chocolate, finely chopped
• 1/2 cup (120ml) heavy cream