Spray a wok with olive oil and place over high heat. Add red onion, garlic and ginger and stir-fry until softened.
Prepare Hokkien noodles according to packet instructions. Drain and set aside.
Add broccoli, carrot, red capsicum, green capsicum, baby corn and bok choy and stir-fry for 8-9 minutes, until tender-crisp. Add tofu, noodles, oyster sauce and chilli flakes and mix well. Reduce heat to low and cook for 3-4 minutes, stirring.
Divide stir-fry between 4 bowls and garnish with cashews, sesame seeds and fresh coriander leaves.