Place noodles in a heatproof bowl. Cover with boiling water. Stand for 2 to 3 minutes or until tender. Using a fork, separate noodles. Drain.
Meanwhile, heat a wok over high heat. Add 1 tablespoon peanut oil. Swirl to coat. Add mince. Cook, stirring with a wooden spoon to break up mince, for 8 minutes or until browned. Transfer mince to a bowl, draining fat. Add remaining ½ tbs peanut oil to wok. Swirl to coat. Add brown onion and garlic. Stir-fry for 1 minute.
Add broccoli, corn, carrot and capsicum. Stir-fry for 3 to 4 minutes or until tender. Return mince to wok. Add soy sauce, barbecue sauce and sesame oil. Stir-fry for 1 minute. Add noodles and green onion. Stir-fry to combine. Serve.