1. Sauté chicken, onion, and bell pepper in hot oil in a large skillet over medium-high heat 5 minutes. Stir in rice, next 3 ingredients, and, if desired, salt. Bring mixture to a boil; cover, reduce heat to low, and simmer 15 minutes or liquid is absorbed and rice is tender. Remove from heat, and stir in spinach. Transfer to a serving platter, and sprinkle with cheese.