Marinate chicken with light soy sauce and ground black pepper. This is an optional step, but I feel it infuses the meat with some flavor.
Pound garlic cloves and Bird's eye chiles in a mortar and pestle until it turns into a coarse paste. Set aside.
Add oyster sauce, fish sauce, dark soy sauce, and dark or light brown sugar in a small bowl. Mix until well combined.
Heat oil in a wok or a heavy-bottomed skillet/cast iron pan over medium, add garlic and Thai chili mixture, saute until fragrant. Do not burn the red chili-garlic mixture.Tip: Make sure to turn on your kitchen exhaust fan, range hood, or open the kitchen windows to avoid inhaling the chili pepper fumes. Add chicken strips in a single layer, leave undisturbed for about a minute or so (depending on how thick the pieces are) to get a good sear. Then stir-fry the chicken until is almost cooked through and turns a light golden color.
Next, add sliced onions and red bell peppers, saute until onions turn translucent and peppers turn crisp-tender.
Add the sauce mixture, cook for another minute.
Add jasmine rice and cook, tossing the rice until everything is combined and heated through, about 3 to 4 minutes.
Check for seasoning and add salt if needed. I didn't need to add any salt.
Add Thai basil leaves, switch off the heat, toss gently, until the leaves wilt.