Heat oven to 400°F. Spray 3-quart casserole with cooking spray. In 3-quart saucepan, heat soup and milk to boiling over high heat, stirring frequently. Stir in mixed vegetables, onion and sage. Heat to boiling, stirring frequently; remove from heat.
Stir in chicken and stuffing mix. Spoon into casserole. Sprinkle with pepper and paprika.
Bake uncovered about 15 minutes or until hot in center.