TOSS NOODLES: When there are 2 minutes remaining for the noodles to be done, melt the butter in the same skillet over medium-high heat. Add the garlic, ginger, and white portion of scallions and saute until fragrant, about 45-60 seconds. Season the ginger garlic mixture with the soy sauce, sesame oil, fish sauce, oyster sauce and sugar and stir to combine. Add the prepared noodles, stir to combine, let sit for 1 minute and sizzle in the pan, then toss, and continue to cook and toss for another 2 minutes. This gives the noodles a smoky, toasty flavor.