Classic Chocolate Layer Cake

Ingredients

• 1 3/4 cups all-purpose flour, sifted
• 3/4 cup cocoa powder, sifted
• 2 tsp instant espresso powder
• 1 tsp baking powder
• 1 tsp baking soda
• 3/4 tsp salt
• 1 cup unsalted butter, at room temperature
• 1 2/3 cups granulated sugar
• 2 eggs
• 2 tsp vanilla
• 1 1/2 cups buttermilk
• 3/4 cup cold unsalted butter, cubed
• 8 oz bittersweet chocolate, melted and cooled
• 1/4 cup cocoa powder, sifted
• 1/4 tsp salt
• 3 cups icing sugar, sifted
• 1/3 cup milk
• 1 tsp vanilla