Follow these straightforward steps to prepare delicious beef with oyster sauce:

1. Prepare the Beef: Thinly slice the beef against the grain for tenderness.
2. Mix the Marinade: In a bowl, combine sliced beef with oyster sauce and soy sauce. Let it marinate for about 10 minutes.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
4. Sauté the Garlic: Add minced garlic to the hot oil and sauté for 30 seconds until fragrant.
5. Cook the Beef: Add the marinated beef to the skillet. Stir-fry for about 3-5 minutes, or until the beef is browned and cooked through.
6. Add Vegetables: Incorporate the sliced bell pepper and broccoli florets. Stir-fry for an additional 3-4 minutes until the vegetables are tender-crisp.
7. Serve: Once fully cooked, remove from heat and serve hot with rice or noodles.

These simple instructions will guide you in creating an incredible beef with oyster sauce dish effortlessly.