Make the Miso Sauce: Add all sauce ingredients to a medium bowl. Stir until smooth. Set aside.
2 tbsp white miso paste, 2 tbsp tahini or peanut butter, 2 tbsp maple syrup, 2 tbsp tamari or reduced sodium soy sauce, 2 tbsp sesame oil, 1 tbsp rice vinegar, 2 tsp chili-garlic sauce, 4 cloves garlic, grated or crushed, ⅓ cup warm water
Cook the Noodles: Prepare noodles according to package directions. Once tender, drain and set aside.
250 g dry wheat noodles
Cook Tofu or Tempeh (Optional): If using tempeh or tofu, heat 1 tbsp oil in a large pan, over medium-high heat. When the pan is hot, add the tempeh or tofu cubes. Cook for 6-8 min, breaking apart into smaller pieces, until golden-brown. Remove the pan from the heat, then drizzle over 1 tbsp tamari. Toss to combine. Transfer to a plate and set aside.
Stir Fry the Veggies: Heat 2 tsp oil over medium-high heat. Add the mushrooms, cabbage and onions. Season with a pinch of salt and pepper. Cook for 4-6 min, stirring occasionally, until tender. Add green onions, reserving some for serving. Cook for another 2-3 min, stirring often, until tender-crisp.
3 cups green cabbage, chopped, 3 cups sliced mixed mushrooms, 1 small white onion, thinly sliced, 1 bunch green onions, thinly sliced
Add Noodles & Sauce: To the pan, add drained noodles and miso sauce. Cook for 1-2 min, tossing gently, to coat noodles in sauce.
For Serving: Divide noodles between bowls. Top with tofu or tempeh (if using), green onions, sesame seeds and toasted nori. Drizzle more chili-garlic sauce over top, if desired.