Combine soy sauce, sriracha, 1 tablespoon of sesame oil and garlic in a bowl. Stir to combine and set aside.
Cook noodles according to the package instructions.
While the noodles are cooking, heat the remaining tablespoon of sesame oil in a large pan over medium heat. Add the white part of the onions to the pan and sauté for 30 seconds.
Add your veggies to the pan with half of the sauce. Sauté the veggies for 5-7 minutes or until tender-crisp.
Add the cooked noodles to the pan along with the remaining sauce and green parts of the onion. Toss to combine. Taste and add additional soy sauce, sriracha and/or sesame oil to taste.
Serve immediately or separate into individual containers and save for later.