Birthday Chocolate Sheet Cake | Recipe Saver

Ingredients

• 1/2 cup unsalted butter, room temperature, plus more, to taste, for greasing the pan
• 2 cups all-purpose flour, plus more, to taste, for dusting the pan
• 6 ounces bittersweet chocolate, chopped
• 1 cup brewed coffee
• 2/3 cup unsweetened cocoa powder, not Dutch-process, plus more, to taste, for topping
• 3 large eggs, room temperature
• 1 cup buttermilk, room temperature
• 2 teaspoons vanilla extract
• 1 3/4 teaspoons kosher salt
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 2 1/2 cups light brown sugar, packed
• 1/4 cup vegetable oil
• 3/4 cup heavy cream, chilled
• granulated sugar, to taste