Bring a large pot of water to a boil. Add spaghetti and cook according to package directions, about 10 minutes. Set aside 2 tbsp. pasta water then drain and set aside.

In a bowl, prepare garlic sauce by whisking together soy sauce, oyster sauce, garlic powder, sugar, and water. Set aside.

In a large saute pan over medium heat, heat the oil. Add the garlic and saute until aromatic but not browned. Then add the butter to pan and let it melt. Cook until garlic is slightly brown.

Toss the drained spaghetti into the pan and mix with garlic sauce. Add the scallion and set aside.

For the shrimp, in a large saute pan over medium heat, heat the olive oil. Add the garlic and saute until it begins to soften.

Add the shrimp and saute for 2 minutes. Then add the oyster sauce and simmer until the shrimp is cooked through and the flavors have combined, about 5 more minutes.