Cook the spaghetti to al dente, according to package directions. Drain.
Mix together the oyster sauce, soy sauce, sugar, and sesame oil. Set aside.
In a skillet over medium-low heat, melt the butter and add the garlic. Cook, stirring, for 5 minutes. Adjust the heat as necessary to avoid browning the garlic, as that will make it taste bitter.
Stir in the oyster sauce mixture and cook an additional 1 to 2 minutes.
Add the cooked spaghetti and the parmesan cheese and toss to coat.
Top with the sliced green onions.
Notes
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