Boston Cream Pie Recipe - Once Upon a Chef

Ingredients

• 1¾ cups whole milk
• 2 tablespoons unsalted butter
• 4 egg yolks
• 2/3 cup sugar
• ¼ cup cornstarch
• ¼ teaspoon salt
• 2 teaspoons vanilla extract
• 1 tablespoon rum
• 1 cup cake flour, (spooned into measuring cup and leveled-off)
• 1 teaspoon baking powder
• 3 large eggs, (at room temperature)
• 2 large egg yolks, (at room temperature)
• ¾ cup sugar
• 1 teaspoon vanilla extract
• ¼ cup whole milk
• ¼ cup water
• ¼ cup sugar
• ½ cup heavy cream
• 4 oz bittersweet chocolate, (chopped)