Chicken Fajita Bake

Name: Chicken Fajita Bake
Ingredients: 2 pounds boneless chicken breasts, diced; 1 tablespoon vegetable oil; 1 large tomato, diced; 1 green bell pepper, cut into strips; 0.5 large onion, cut into strips; 0.75 cup water; 2 (1.27 ounce) packets fajita seasoning; 10 (6 inch) corn tortillas, cut in quarters; 1 (16 ounce) can pinto beans, rinsed and drained; 2 cups shredded Cheddar cheese; 1 (16 ounce) can black beans, rinsed and drained; 0.25 cup green onions, chopped; 0.25 cup chopped cilantro