Lemon Chicken Orzo Soup

orzo pasta

olive oil

carrots, chopped, or more to taste

ribs celery, chopped

onion, chopped

garlic, minced

dried thyme

dried oregano

salt and ground black pepper

bay leaf

cartons fat-free, low-sodium chicken broth

fresh lemon juice

lemon, zested

cooked chicken breast, chopped

baby spinach leaves

lemon, sliced for garnish (optional)

grated Parmesan cheese (optional)