Prepare the Beef:

• Heat 1 tablespoon of vegetable oil in a large skillet or wok over high heat.
• Add the thinly sliced beef and stir-fry until browned and cooked through, about 3-4 minutes. Remove the beef from the pan and set aside.

2. Cook the Vegetables:

• In the same pan, add the remaining tablespoon of vegetable oil.
• Add the sliced onion, bell peppers, and snap peas. Stir-fry for 3-4 minutes until vegetables are tender-crisp.
• Add the minced garlic and ginger, and stir-fry for an additional 1 minute until fragrant.

3. Combine and Flavor:

• Return the beef to the pan with the vegetables.
• Stir in the soy sauce, oyster sauce (if using), hoisin sauce, and black pepper. Mix well to combine.
• Add the cornstarch mixture and stir until the sauce thickens and coats the beef and vegetables.

4. Serve:

• Serve the stir fry over steamed rice or noodles.
• Garnish with sliced green onions and sesame seeds if desired.