Chocolate Banana Cake

Name: Chocolate Banana Cake
Prep time: 1 h
Cook time: 35 min
Total time: 1 h 35 min
Cuisine: American
Ingredients: 3 sticks unsalted butter (softened); 2 cups granulated sugar; 3 cups cake flour; 3/4 teaspoon baking soda; 1 1/2 teaspoons baking powder; 1 teaspoon salt; 3 large egg whites; 1 tablespoon vanilla extract; 1 1/2 cups full-fat buttermilk; 2 large ripe bananas (smashed); 1 cup shredded coconut; 3 cups heavy cream; 2 tablespoons vanilla extract; 1/3 cup sugar; 1/3 cup unsweetened cocoa powder; 10 ounces dark chocolate; 1 cup heavy cream; 2 tablespoons corn syrup; 1 cup toasted coconut