Cook the noodles: Bring a pot of water to a boil. Add the sweet potato glass noodles and cook according to the package instructions, usually around 6-8 minutes. Once cooked, drain the noodles and rinse under cold water to stop the cooking process. Set aside.
- Prepare the sauce: In a small bowl, whisk together 1 tablespoon soy sauce, 1 tablespoon maple syrup, 1 tablespoon sesame oil, and rice vinegar. Set aside.
- Stir-fry the vegetables: Heat vegetable oil in a large skillet or wok over medium heat. Add the garlic and onions and sauté for 2-3 minutes until fragrant. Add the mushrooms and carrots, and stir-fry for another 5-7 minutes until the vegetables are tender and slightly caramelized. Toss in the spinach and cook for another minute until wilted.
- Combine the noodles and sauce: Add the cooked noodles to the pan with the vegetables. Pour the prepared sauce over the noodles and toss everything together, making sure the noodles are evenly coated with the sauce. Stir-fry for an additional 2-3 minutes.
- Garnish and serve: Remove from heat and sprinkle with sesame seeds. Serve warm and enjoy!