Almond Custard Layer Cake

Ingredients

• 2 1/2 cups (325g) all-purpose flour
• 4 teaspoon baking powder
• 1/2 teaspoon salt
• 3/4 cup (168g) Nellie's Free Range Unsalted Butter, softened
• 1 1/2 cups (310g) sugar
• 3 tablespoons vegetable oil
• 1 tablespoon almond extract
• 4 large Nellie's Free Range Eggs
• 1 1/4 cups (300ml) milk
• 3 Nellie's Free Range Eggs, yolks only
• 1/2 cup (104g) sugar
• 2 tablespoons plus 1 teaspoon cornstarch
• 1 1/2 cups (360ml) milk
• 2 tablespoon (28g) Nellie's Free Range Salted Butter
• 1 1/2 teaspoons almond extract
• 1 1/4 cups (280g) Nellie's Free Range Salted Butter, room temperature
• 1 1/4 cups (237g) shortening
• 10 cups (1150g) powdered sugar
• 2 teaspoons almond extract
• 5 to 6 tablespoons (75 to 90ml) water or milk