Prep all ingredients first for this dish. This cooks very fast so its best to have everything ready.
Cut chicken breasts into about 1" bite sized pieces. Chop green onions, separating greens and whites. Mince the garlic.
For the sauce, combine oyster sauce, soy sauce, chili garlic sauce, water, corn starch, and sugar into small bowl. Stir well to combine. Set aside.
Preheat skillet to almost high heat, add 1 tbsp vegetable oil. Once shimmering, add garlic and chili garlic sauce. Cook for 15 seconds.
Add chicken and whites of onions. Cook until chicken is cooked through. This will cook quick, so maybe 5-6 minutes.
Add sauce and stir for 1 minute.
Add green onion tops and basil. Cook until basil is wilted, just a couple minutes.
Serve immediately over jasmine rice.