Asparagus and Leek Soup Recipe - Delicious and Nutritious

Ingredients

• 1.5 lb (680 g) fresh asparagus , chopped, washed, and tough ends removed
• nonfat cooking spray
• 0.5 cup chopped onion
• 1 cup chopped leeks (white part only), washed
• 0.5 cup chopped celery
• 1 small potato , peeled and cubed
• 3.5 cup low-sodium chicken broth
• 0.5 cup non- fat sour cream
• salt and pepper to taste