Cheesy Chicken Enchilada Casserole

Name: Cheesy Chicken Enchilada Casserole
Ingredients: 1/2 large yellow onion; 1 medium red bell pepper; 1 (about 15-ounce) can black beans; 1 (about 15-ounce) can corn kernels; 12 ounces cooked chicken (about 3 cups shredded); 2 tablespoons olive oil; 1 (4.5-ounce) can diced green chiles; 2 (10-ounce) cans enchilada sauce, divided; 18 (5- to 6-inch) corn tortillas, divided; 3 cups shredded Mexican cheese blend (12 ounces), divided; 1 medium tomato; 1/4 cup fresh cilantro leaves and tender stems; 1/4 cup sliced black olives, drained; 1/3 cup Mexican crema