Heat olive oil in an 8 qt stock pot. Add onion and saute 5 minutes. Add garlic, stir and saute 1 minute. Add carrots, celery and zucchini. Season lightly with salt and pepper. Continue to cook 10 minutes.
2
Stir in diced tomatoes with juice, chicken broth, salt and pepper and bring to a boil. Optional: Stir in 1 1/2 t. boquet garni.
3
Add mushrooms, corn and peas. Return to a boil, then reduce heat and simmer 10 minutes.
4
Mix corn starch and water, forming a smooth slurry. Return soup to a boil and whisk in slurry, stirring until soup is thickened.
5
Add cooked chicken and heat through. Remove from heat and stir in minced parsley.