Combine oyster sauce, soy sauce, and cilantro in a small bowl and set aside.

Pat the shrimp dry with paper towels.

In a medium bowl, add shrimp and cornstarch and toss to coat.

Heat half of the cooking oil in a wok or large saute pan over high heat.

Add the shrimp in a single layer and cook until one side is seared brown, about 1 minute.

Flip and sear the other side of each shrimp, about one more minute. Remove to a plate or bowl.

Reduce the heat to medium and let the wok cool slightly.

Add the remaining cooking oil, green onion, garlic, and ginger and stir fry for 1 minute until fragrant.

Pour in the sauce mixture and add the shrimp back into the pan.

Stir fry for another minute until shrimp is cooked through.

Serve immediately.