Steps
1. Heat the vegetable oil in a pan over medium-high heat.
2. Add the minced garlic and stir-fry for about 30 seconds until fragrant.
3. Add the sliced beef and cook for 2-3 minutes until browned.
4. Add the bell pepper and broccoli, stir-frying for an additional 2-3 minutes until the vegetables are tender but crisp.
5. Pour in the soy sauce and oyster sauce, stirring to combine.
6. Add the cornstarch mixture to thicken the sauce, cooking for another minute.
7. Season with salt and pepper to taste.
8. Serve hot over rice or noodles if desired.