Black-Bottom Cupcakes

INGREDIENTS

• :
• 8 oz. cream cheese, at room temperature
• 1/3 cup granulated sugar
• 1 large egg, at room temperature
• 2 oz. bittersweet chocolate, coarsely chopped
• 1½ cups all-purpose flour
• 1 cup firmly packed light brown sugar
• 5 tablespoons naturally unsweetened cocoa powder (not Dutch-process)
• 1 teaspoon baking soda
• ¼ teaspoon salt
• 1 cup water
• 1/3 cup unflavored vegetable oil
• 1 tablespoon white vinegar
• 1 teaspoon vanilla extract