Heat oil in a large skillet over medium-high heat. Add garlic, onion, and chilies; cook 1 minute until fragrant.
Add minced chicken and cook 4–5 minutes, breaking up lumps, until no pink remains.
Stir in bell peppers, soy sauce, fish sauce, oyster sauce, brown sugar, and broth. Simmer 2–3 minutes until sauce slightly reduces.
Remove from heat and fold in basil leaves until wilted. Serve over hot rice.
