In a small bowl, whisk together the soy sauce, dark soy sauce, sesame oil, water, and sugar until combined.
Cook noodles as per instructions and set aside.
Add the vegetable oil to a large skillet and place over medium-high heat. Once hot, add garlic, the white part of the onion, and chili. Stir-fry for 2-3 minutes.
Add the noodles and pour the sauce over it and mix until the noodles are fully coated. Add the bean shoots and cook for 3 minutes.
Add the rest of the green onion and cook for a further 2 minutes, or until they are wilted.
Remove the noodles off the heat, sprinkle with sesame seeds and serve immediately.
