White Forest Cake

Name: White Forest Cake
Prep time: 45 min
Cook time: 1 h
Total time: 1 h 45 min
Cuisine: American
Ingredients: 1 ⅓ cups all-purpose flour; 3 tablespoons corn starch; 1 ½ teaspoon baking powder; ½ teaspoon salt; ½ cup unsalted butter (room temperature); 1 ½ cups granulated sugar; 3 egg whites (room temperature); ¾ cup sour cream (room temperature); 3 tablespoons vegetable oil; 1 teaspoons vanilla extract; ⅓ cup white chocolate (finely chopped from a bar); 1 ½ cups tart cherries (frozen); ¼ cup granulated sugar; ½ tablespoon corn starch; 1 cup heavy whipping cream; ½ cup powdered sugar; ½ teaspoon vanilla extract