- 2 ¼ cups (270 grams) all-purpose flour - 1 tablespoon (14 grams) baking powder - 1 teaspoon (6 grams) kosher salt - ½ cup (40 grams) cocoa powder - ½ cup (118 ml) hot freshly brewed coffee - ½ cup (118 ml) vegetable oil - 1 cup (190 grams) packed brown sugar - 1 cup (237 ml) whole milk - ½ cup (113 grams) sour cream or full-fat plain Greek yogurt - 2 eggs lightly beaten - 1 tablespoon (15 ml) vanilla - 1 ½ cups (262 grams) semi-sweet chocolate chunks or chips, divided