White Chicken Chili Casserole

Name: White Chicken Chili Casserole
Ingredients: 1 tablespoon extra-virgin olive oil; 1 cup chopped onion, plus more for garnish; 2 poblano peppers, seeded and chopped; 1 jalapeño pepper, seeded and finely chopped; 2 large cloves garlic, minced; 1 pound boneless, skinless chicken breasts, cut into bite-size pieces; 1 ½ teaspoons ground cumin; 1 teaspoon dried oregano; ½ teaspoon salt; ¼ teaspoon ground pepper; 1 cup low-sodium chicken broth; 2 (15 ounce) cans no-salt-added white beans, rinsed; ¼ cup sour cream; Shredded sharp Cheddar cheese (optional); Crumbled tortilla chips (optional); Chopped fresh cilantro (optional)