Cook the soba noodles according to package directions. They cook quickly. Do not overcook!
Meanwhile, whisk together the miso rice vinegar, maple syrup, sriracha, and water in a small bowl. Set aside.
Heat the oil in a large nonstick skillet or wok over medium-high heat. Add the ginger and garlic and sauté just until fragrant, about 30 seconds.
Add the peppers, cabbage, and snow peas and sauté until starting to soften, but still tender-crisp, stirring frequently, about 3 to 4 minutes.
Add the cook noodles to the skillet and stir to combine.
Pour in the sauce and mix well to incorporate.
Garnish with chopped peanuts and serve.