In a pot of boiling water, cook the rice noodles according to package instructions. Drain and set aside.
In a large pot, heat the sesame oil over medium heat. Add the diced onion and minced garlic, sautéing until the onion is translucent.
Add the julienned carrot, sliced bell pepper, broccoli florets, and snap peas to the pot. Stir-fry for about 4-5 minutes until the vegetables are crisp-tender.
Pour in the vegetable broth, soy sauce, miso paste (if using), and grated ginger. Stir well to combine and bring the soup to a gentle simmer.
Add the cooked rice noodles to the soup and cook for an additional 2-3 minutes to heat through.
Taste the soup and adjust the seasoning if necessary. You can add more soy sauce for saltiness or a splash of lime juice for acidity.
Ladle the soup into bowls, and garnish with chopped green onions and fresh cilantro. Serve with lime wedges on the side for added freshness.
Notes
Feel free to customize the vegetables based on your preference.