Grandma's Apple Cake | Cooking Professionally

Ingredients

• 5 large egg yolks, room temperature
• 2 small tart apples, peeled, cored, and halved
• 1 cup plus 2 tablespoons unsalted butter, softened
• 1 1/4 cups sugar
• 2 cups all-purpose flour
• 2 tablespoons cornstarch
• 2 teaspoons cream of tartar
• 1 teaspoon baking powder
• 1/2 teaspoon salt
• 1/4 cup 2% milk
• confectioners' sugar, to taste