Assemble your ingredients and check you have everything.
Cook the noodles according to the package directions. Make the sauce while the noodles are cooking.
In a blender, place the broth, soy sauce, mirin, miso, sesame oil, garlic, and ginger. Blend at high speed until smooth. Set this aside.
Drain the cooked noodles. Place the sauce in the pot over medium heat and allow it to come to a simmer. As soon as the sauce begins to reduce, return the noodles to the pot of sauce and toss to coat them evenly. The starch released by the noodles will help the sauce to thicken and cling to them.
Transfer the coated noodles into serving bowls and top with protein and veggies of your choice. Garnish with scallions and sesame seeds.