In a large skillet, heat oil over medium heat. Add sausage; cook and stir until lightly browned. Remove from pan., Add onion to same skillet; cook and stir 3-5 minutes or until tender. Stir in beans, tomatoes, corn and sausage; bring to a boil. Reduce heat; simmer, uncovered, 5 minutes. Stir in rice and spinach; cook 2-3 minutes or until heated through and spinach is wilted. Sprinkle with cheese and cilantro.