Ingredients

½ cup diced yellow onion (¼-inch pieces) (about ½ yellow onion)

½ cup diced celery (¼-inch pieces) (about 1 medium celery stalk)

½ cup diced carrot (¼-inch pieces) (about 1 medium carrot)

2 cups diced cremini mushrooms (¼-inch pieces) (about 6 oz)

1½ cups long-grain white rice

3 cups chicken stock or broth

2 cups diced boneless, skinless chicken thighs (½-inch pieces) (about 1 lb cooked chicken)

1 bay leaf

3 cups small broccoli florets (about 6 oz)

2 tablespoons butter

¼ cup grated Parmigiano-Reggiano

¼ cup grated Gruyère