In a large, deep skillet, heat up oil over medium heat. Add chicken, season with salt and pepper and cook until done.
Add taco seasoning, water and simmer for 2 to 3 minutes. Add black beans, stir well. Add rice and stir in. Add crushed tomatoes, salsa and simmer until bubbly. Add corn and stir well.
Sprinkle with cheese, cover and let simmer for about 3 minutes or until the cheese is melted. Top with chopped onions and tomatoes. Serve with sour cream and tortilla chips.