Heat a Dutch oven coated with cooking spray over medium-high heat. Add chicken, chopped onion, and red bell pepper; sauté 5 minutes. Stir in rice, lemon juice, 1/4 teaspoon salt, black pepper, and broth; bring to a boil. Cover, reduce heat, and simmer 15 minutes or until rice is tender. Stir in artichokes, and cook 1 minute or until thoroughly heated. Sprinkle with cheese.