Start by boiling some water and cooking the buckwheat noodles until tender. The noodles are ready when they turn soft and slightly chewy.
Once the noodles are cooked, rinse them under cold water to stop the cooking process. This helps them feel firm and prevents them from sticking together.
While the noodles are cooling, chop up the bell pepper, carrots, sugar snap peas, and dice the avocado into bite-sized pieces.
In a bowl, whisk together tahini, miso, minced ginger, garlic powder, maple syrup, rice vinegar, sesame oil, and water. The mixture should be creamy and smooth. If it is too thick, simply add a splash more water to thin it out.
In a large bowl, combine the cooled noodles, veggies, and dressing. Gently toss everything until the noodles and veggies are coated.
Let the salad sit for a few minutes before serving for the flavors to mingle.