Chicken Mushroom Stew

Name: Chicken Mushroom Stew
Prep time: 20 min
Cook time: 4 h
Total time: 4 h 20 min
Cuisine: American, World Cuisine
Ingredients: 6 boneless skinless chicken breast halves (4 ounces each); 2 tablespoons canola oil, divided; 8 ounces fresh mushrooms, sliced; 1 medium onion, diced; 3 cups diced zucchini; 1 cup chopped green pepper; 4 garlic cloves, minced; 3 medium tomatoes, chopped; 1 can (6 ounces) tomato paste; 3/4 cup water; 2 teaspoons each dried thyme, oregano, marjoram and basil; Chopped fresh thyme, optional