Heat oven to 400 degrees Fahrenheit.
Prepare frozen peas, chicken nuggets, and macaroni and cheese according to directions on the packaging.
Cut cooked chicken nuggets into quarters.
In a large bowl, mix the macaroni and cheese, peas, and chicken together.
Spray an 8×6 baking dish with non-stick cooking spray then pour mixture into dish.
Bake for 15 minutes then remove from oven and top with cheese.
Bake for an additional 5 minutes or until cheese is melted.