Miso, Chicken, and Green Onion Soup

Ingredients (9)

• ✓ 1 tablespoon vegetable oil, or as needed
• + 1 onion, chopped add to pantry
• + 1 ½ portobello mushrooms, stemmed and sliced add to pantry
• + 8 cups low-sodium chicken broth, divided add to pantry
• ✓ 2 tablespoons miso paste
• ✓ sea salt and ground black pepper to taste
• + sea salt and ground black pepper to taste add to pantry
• + 2 cups cubed, cooked chicken add to pantry
• + 5 green onions, trimmed and chopped add to pantry