Grate the tofu on the coarse side of a box grater. Mix the marinade ingredients and coat the tofu. Spread on a lined baking tray and bake at 220°C for 30 min, stirring every 10 min.
Whisk together all the stir fry sauce ingredients in a small bowl. Set aside.
Cook the noodles according to packet instructions, reserving a splash of noodle water. Whisk together the peanut butter, chili oil, maple syrup, and rice vinegar. Loosen with a tbsp or two of noodle water, then toss the drained noodles through the sauce.
Heat a splash of oil in a large wok on high heat. Fry the garlic and ginger for 30 sec until fragrant. Add the onion, bell peppers, and green beans and stir-fry for 2–3 min until just tender.
Add the tofu and pour over the sauce. Toss on high heat for 1–1½ min until glossy and everything is coated.
Divide the noodles between bowls, top with the stir-fry, scatter over the peanuts, green onions, and sesame seeds, and serve immediately.
