Chocolate Blackout Cake | America's Test Kitchen

Ingredients

• 1 1/4 cups (8¾ ounces/248 grams) granulated sugar
• 1/4 cup (1 ounce/28 grams) cornstarch
• 1/2 teaspoon table salt
• 2 cups half-and-half
• 1 cup whole milk
• 6 ounces (170 grams) unsweetened chocolate , chopped
• 2 teaspoons vanilla extract
• 8 tablespoons unsalted butter (1 stick), plus extra for greasing pans
• 1 1/2 cups (7½ ounces/213 grams) all-purpose flour , plus extra for dusting pans
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 3/4 cup (2¼ ounces/64 grams) Dutch-processed cocoa powder
• 1 cup brewed coffee
• 1 cup buttermilk
• 1 cup packed (7 ounces/198 grams) light brown sugar
• 1 cup (7 ounces/198 grams) granulated sugar
• 2 large eggs
• 1 teaspoon vanilla extract