Heat oven to 350°F. Stir soup and 1/4 cup water in large bowl. Season chicken with 1/2 teaspoon black pepper, onion powder and poultry seasoning. Heat oil in 12-inch skillet over medium-high heat. Add chicken and cook until well browned, stirring occasionally. Add chicken and vegetables to soup mixture and stir to coat. Spoon chicken mixture into 2-quart round casserole. Microwave remaining water in microwavable bowl on HIGH for 1 to 2 minutes or until hot. Add potato flakes and stir until water is absorbed. Stir in milk and remaining black pepper. Loosely cover and microwave on HIGH for 2 minutes or until mixture is hot. Spread potato mixture over chicken mixture. Sprinkle with cheese. Bake for 40 minutes or until chicken mixture is hot and bubbling.