Black Bottom Cupcakes with Cream Cheese

Name: Black Bottom Cupcakes with Cream Cheese
Ingredients: 8 ounces cream cheese regular or reduced fat, at room temperature; 1/3 cup granulated sugar; 1 large egg at room temperature; 2 ounces bittersweet or semisweet chocolate coarsely chopped; 1 1/2 cups all-purpose flour; 1 cup firmly packed light brown sugar; 5 tablespoons natural unsweetened cocoa powder (not Dutch-process); 1 teaspoon baking soda; 1/4 teaspoon salt; 1 cup water; 1/3 cup unflavored vegetable oil; 1 tablespoon white or cider vinegar; 1 teaspoon vanilla extract