In a large pot over high heat, add oil to pan. Add garlic and onions; sauté for 30 seconds, stirring constantly.
Add chicken broth and water; bring to boil. Add orzo and beans. Cover and simmer 10 minutes until pasta is cooked.
Stir in chives (if using), lemon juice and spinach and heat through. Season to taste with salt and pepper.
Serve topped with shaved Parmesan cheese (optional).