Bring a large pot of water to a boil. Cook the noodles according to the package instructions in the boiling water. Drain and set aside.
Mix together the soy sauce, vegetable oil, sesame oil, sugar, vinegar, chile oil and garlic in a small pitcher. Set aside.
Add the butter to a large skillet over medium-high heat. When the butter has melted, add the mushrooms and cook until thoroughly browned, 5 to 7 minutes. Pour in the sauce and stir to combine. Remove the skillet from the heat. Add the noodles and toss to combine. Sprinkle over the green onions and give one final toss. Serve.