Prep the Ingredients: Wash and cut the vegetables. Mince the garlic and grate the ginger.
Cook the Chicken: Heat olive oil in a large skillet over medium-high heat. Add the chicken pieces and cook until they are browned and nearly cooked through, about 6-7 minutes.
Add Vegetables: Add the broccoli and bell peppers to the skillet. Cook for another 5 minutes, stirring frequently until the vegetables are just tender.
Season: Stir in the garlic, ginger, soy sauce, and oyster sauce. Cook for another 2 minutes until everything is well coated and the chicken is cooked through.
Serve: Sprinkle with black pepper and optional sesame seeds. Serve hot over cooked brown rice.
