Spring Chicken Soup

Name: Spring Chicken Soup
Ingredients: 1 tbsp. extra-virgin olive oil; 1 medium onion, chopped; 2 large carrots, chopped; 2 stalks celery, chopped; 1/2 lb. asparagus, trimmed and cut into 1 pieces; 2 zucchini, cut into half moons; 2 cloves garlic, minced; 1 tsp. oregano; Kosher salt; Freshly ground black pepper; 6 c. chicken broth; 2 sprigs thyme; 1 lb. boneless skinless chicken breast; 1/4 c. lemon juice; 1 c. frozen peas; 1 c. frozen corn; Lemon slices, for garnish; Freshly chopped parsley, for garnish