Add the oyster sauce, brown sugar, soy sauce and sesame oil to a bowl and stir until combined.
Bring a large pot of water to a boil and cook the noodles according to the package directions (boil for 7-10 minutes). Drain the cooked noodles in a colander, then set aside.
While the pasta cooks, mince the garlic and slice the green onions. Melt the butter in a large skillet over medium-low heat. Once the butter is melted and bubbly, add the garlic and onions and saute