Spray 1-quart microwave-safe dish with cooking spray; set aside. Place rice in medium bowl. Add ham, cheese and peas; mix lightly. Spoon into prepared dish; smooth into even layer with spoon. Microwave on HIGH 1 minute; stir. Microwave 30 seconds or until thoroughly heated.
Conventional Oven Directions
Assemble casserole as directed. Spoon into ovenproof 1-quart baking dish sprayed with cooking spray. Bake at 350°F until thoroughly heated, about 15 to 20 minutes.