Boil the noodles. Bring a large pot of salted water to a rolling boil. Add the noodles and cook until just shy of al dente. This usually takes 1–2 minutes less than the package suggests. Before draining, reserve 1/2 cup of pasta water.

Prep the garlic and scallions. While the water heats and the noodles cook, mince the garlic and slice the scallions. Keep them close—you’ll move quickly once the butter melts.

Make the sauce base. In a large skillet over medium heat, melt the butter with the oil. The oil helps prevent the butter from burning while still giving a rich taste.

Sauté the garlic. Add the minced garlic and cook for 30–60 seconds, stirring often, until fragrant and lightly golden. Do not brown it deeply—burnt garlic turns bitter fast.

Add the seasonings. Stir in the soy sauce, oyster sauce, brown sugar, and black pepper. Let it bubble for 15–20 seconds to marry the flavors.

Loosen the sauce. Add 1/4 cup of reserved pasta water and the sesame oil. Stir until glossy and slightly thickened. If it looks tight, splash in a bit more pasta water.

Toss with noodles. Add the drained noodles directly to the skillet. Toss until every strand is coated and shiny. If you like a little heat, add red pepper flakes or chili crisp now.

Finish and serve. Fold in the scallions. If using Parmesan, sprinkle it over and toss again for a subtle savory finish. Taste and adjust seasoning—more soy for salt, more sugar for balance, or a tiny knob of butter for extra richness.

Plate and enjoy. Serve immediately while hot and silky. These are best eaten right away.