For the Cake

• Vegetable oil cooking spray
• ½ cup whole milk
• 2 tablespoons unsalted butter
• ¾ cup all-purpose flour
• ¼ cup unsweetened Dutch-process cocoa powder
• 1 ½ teaspoons baking powder
• ½ teaspoon salt
• 2 large eggs, room temperature
• ¾ cup granulated sugar
• 1 ½ teaspoons pure vanilla extract

For the Syrup

• ¼ cup granulated sugar
• ⅓ cup chocolate-flavored liqueur, such as Godiva

For the Mousse

• 2 ½ cups heavy cream
• 12 ounces white chocolate, finely chopped
• ½ cup coarsely chopped peppermint candies or candy canes

For the Pudding

• 8 ounces milk chocolate, finely chopped
• 2 cups heavy cream
• 3 large egg yolks, room temperature

For Serving

• 1 ½ cups heavy cream
• ¼ cup confectioners’ sugar
• ¼ cup coarsely chopped peppermint candies or candy canes