Start boiling a large pot of water for the noodles then, in a medium bowl, whisk together the tamari, sesame oil, maple syrup, miso, vinegar and garlic until smooth and combined. Set aside.
Cook the soba noodles according to the package instructions or once the water is fully boiling, cook noodles for about 3-4 mins, until just tender. When the noodles are done, using a strainer, rinse well under cool running water, tossing them to remove excess starch.
In a large non-stick skillet, heat 2 tsp oil over medium-high heat. When the pan is hot, add most of the green onions, reserving some for topping. Cook for 1 min, stirring often, until tender.
For a cold salad, Add the sauce and noodles to the pan with the green onions or add the green onions, sauce and noodles to a large mixing bowl and toss to coat the noodles in the sauce. For hot noodles, Add the sauce and noodles to the pan with the green onions, toss and cook for 1-2 minutes to heat through.
Divide noodles between bowls. Top with toasted sesame seeds, remaining green onions, and nori, if using. Can be served warm, at room temperature or chilled.