Chicken Teriyaki Udon Noodles

Name: Chicken Teriyaki Udon Noodles
Ingredients: one 400g package of udon noodles; 3 tablespoons olive oil, divided; 2 large chicken breasts; 1 bell pepper, sliced into small strips; 1 small zucchini ,sliced into small strips; 2 medium carrots, sliced into small strips; 1 broccoli crown, cut into medium sized florets; 3/4 cup vegetable broth; 3 tablespoons soy sauce; 3 tablespoons brown sugar; 2 teaspoons sesame oil; 1 tablespoons minced fresh ginger; 2 cloves garlic, minced; 2 tablespoons cornstarch + 3 tablespoons water; 1 tablespoon sesame seeds (optional)