Cook the noodles according to the package directions. Drain, rinse, and set aside.
In a small bowl, whisk to combine the soy sauce, brown rice syrup, sesame oil, rice vinegar, 1 teaspoon ginger, and sriracha. Set aside.
Heat the oil in a large skillet or wok over medium-high heat. Add the garlic, remaining ginger, bell peppers, carrots, and mushrooms. Cook until tender, stirring frequently until tender, about 3 minutes.
Add the snow peas, spinach, and bean sprouts and cook until the spinach is wilted, about 2-3 minutes.
Stir in the noodles, soy sauce mixture and scallions. Gently toss to combine.