Stuffed Pepper Soup

Name: Stuffed Pepper Soup
Ingredients: 1 tablespoon extra-virgin olive oil; 3 large bell peppers, chopped; 1 poblano pepper, chopped; 1 medium onion, chopped, plus more for serving; 1 pound lean ground beef; 2 cloves garlic, minced; 2 teaspoons ground cumin; 1 teaspoon ground coriander; ½ teaspoon ground pepper; ¼ teaspoon salt; 4 cups low-sodium chicken broth; 1 cup quick-cooking brown rice; ¼ cup chopped fresh cilantro, plus more for serving; Shredded Cheddar cheese & crushed tortilla chips for serving