Prepare the Chicken – Toss the chicken with cornstarch until evenly coated.
Sear the Chicken – Heat vegetable oil in a pan over medium-high heat. Cook the chicken for 4-5 minutes until golden brown and fully cooked. Remove and set aside.
Sauté the Aromatics – In the same pan, add a little more oil if needed and sauté garlic, ginger, and scallions for about 30 seconds until fragrant.
Make the Sauce – Stir in soy sauce, oyster sauce, sugar, sesame oil, black pepper, and chicken broth. Let it simmer for 2 minutes.
Thicken the Sauce – Stir in the cornstarch slurry and cook until the sauce slightly thickens.
Combine & Serve – Return the cooked chicken to the pan and toss it in the sauce. Serve hot, garnished with sesame seeds.