In a saucepan, bring millet and broth to a boil. Reduce heat; simmer, covered, until millet is tender and broth is absorbed, about 30-35 minutes. Transfer to a large bowl and cool.
Meanwhile, cut tops off peppers and remove seeds. In a large saucepan, cook peppers in boiling water for 3-5 minutes. Drain and rinse in cold water; set aside.
With a fork, fluff cooled millet. Add the corn, onion, celery, nuts, green onion and seasonings; blend well. Spoon into sweet peppers. Drizzle with oil. Place in a baking dish coated with cooking spray. Cover and bake at 350° for 55-60 minutes or until tender. Yield: 2 servings.