Marinate chicken thighs with light soy sauce, white pepper, and cornstarch for 15 minutes.
Heat cooking oil in a wok over medium-high heat. Add ginger, garlic, and fermented black beans; stir-fry until fragrant, about 1 minute.
Add marinated chicken thighs to the wok and stir-fry until the skin is lightly browned, about 3-4 minutes.
Add bell peppers and onions, stir-fry for 2 minutes. Then add chicken broth, light soy sauce, oyster sauce, dark soy sauce, and sugar.
Bring to a simmer, cover, and braise over medium-low heat for 15-20 minutes, or until chicken is cooked through and tender.
Stir in the cornstarch slurry and cook for another 1-2 minutes until the sauce thickens. Serve hot with steamed rice.
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