Triple Chocolate Layer Cake

Name: Triple Chocolate Layer Cake
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 1 3/4 cup cake flour (substitute all purpose flour); 1 1/2 cups granulated sugar; 1/2 cup unsweetened Dutch cocoa powder (see notes to sub natural cocoa); 2 teaspoons espresso powder (optional); 2 teaspoons baking powder; 1/2 teaspoon salt; 3/4 cup vegetable oil; 3 large eggs (room temperature); 1/2 cup whole milk (substitute hot water); 1 teaspoon vanilla extract; 1/2 cup hot brewed espresso (substitute hot water); 1 1/2 cups unsalted butter (room temperature); 3 cups powdered sugar; 1 cup unsweetened cocoa powder; 1/2 teaspoon espresso powder (optional); 1/4 teaspoon salt; 3 tablespoons heavy cream; 8 ounces dark chocolate (chopped); 3/4 cup heavy cream