Shredded pepper Jack cheese, salsa, guacamole, sour cream, sliced scallions and fried tortilla strips, for topping
Heat 1 tablespoon vegetable oil in a large skillet over medium heat. Add the onion and cook until softened, about 5 minutes. Stir in the chili powder and cumin and cook for 30 seconds. Add the chicken, black beans and chicken broth, then stir, bring to a simmer and cook until thickened, about 5 minutes. Stir in the lime juice and season with salt and pepper.
Fill 4 serving bowls with the romaine, then add the chicken mixture. Top with cheese, salsa, guacamole, sour cream, scallions and tortilla strips. Serve with lime wedges.