Creating Garlic Beef Skillet is straightforward if you follow these simple steps:

1. Prep the Ingredients: Gather all ingredients and slice the beef, vegetables, and mince the garlic.
2. Marinate the Beef: In a bowl, combine the sliced beef, soy sauce, and oyster sauce. Let it marinate for about 10 minutes.
3. Heat the Skillet: In a large skillet, heat the vegetable oil over medium-high heat.
4. Cook the Beef: Add the marinated beef to the skillet. Cook for about 3-4 minutes until browned, stirring occasionally.
5. Add Garlic: Stir in the minced garlic, and cook for an additional minute until fragrant.
6. Add Vegetables: Add the sliced bell pepper, broccoli florets, sliced carrot, and onion to the skillet. Stir-fry for about 5-7 minutes until the vegetables are tender yet crisp.
7. Thicken the Sauce (Optional): If you prefer a thicker sauce, mix cornstarch with a tablespoon of water to create a slurry. Add it to the skillet and stir until the sauce thickens.
8. Season: Taste and adjust seasoning with salt and pepper as needed.
9. Garnish: Remove from heat and sprinkle sesame seeds on top for added texture and flavor.
10. Serve: Transfer the Garlic Beef Skillet to plates and enjoy immediately.

These steps will guide you in creating this incredible dish effortlessly.