Mocha Boston Cream Pie Recipe

Ingredients

• 2 cups cake flour (8 oz.)
• 1 ¼ cups sugar, divided
• 2 tsp. baking powder
• ½ tsp. table salt
• 6 eggs, separated
• ¾ cup whole milk, room temperature
• ¼ cup canola oil
• 4 Tbsp. unsalted butter, melted and cooled
• 1 Tbsp. pure vanilla extract
• ½ tsp. cream of tartar
• 6 egg yolks
• ⅓ cup cornstarch
• ¾ cup sugar, divided
• 2 Tbsp. Kahlúa liqueur
• 2 ½ cups whole milk
• 4 oz. semisweet bar chocolate, finely chopped
• 1 Tbsp. each pure vanilla extract and instant espresso powder
• 5 Tbsp. unsalted butter, cubed
• ¼ tsp. table salt
• ⅓ cup heavy cream
• 1 Tbsp. corn syrup
• ½ tsp. pure vanilla extract