Creating this amazing Beef Stir-Fry can be straightforward if you follow these clear steps:

1. Prep Ingredients: Start by slicing the beef and vegetables. Ensure everything is ready to go since stir-frying is quick.
2. Marinate Beef: In a bowl, mix the sliced beef with 1 tablespoon of soy sauce and cornstarch (if using). This step adds flavor and tenderizes the meat. Set aside.
3. Heat Wok or Skillet: Place a wok or large skillet over medium-high heat. Drizzle in the vegetable oil and let it get hot.
4. Cook Beef: Add the marinated beef to the hot pan. Stir-fry for 2-3 minutes until the beef is browned. Do not overcrowd the pan; cook in batches if necessary. Remove the beef and set it aside.
5. Stir-Fry Vegetables: In the same pan, add garlic and ginger. Stir for about 30 seconds until fragrant. Then, add the bell peppers, broccoli, and snap peas. Continue stir-frying for another 4-5 minutes until the veggies are tender-crisp.
6. Combine and Flavor: Return the cooked beef to the pan with the vegetables. Add the remaining soy sauce and oyster sauce. Stir to combine all ingredients, cooking for an additional 1-2 minutes.
7. Check for Sauce Consistency: If desired, add a little cornstarch mixed with water to thicken the sauce. Stir well until it reaches your preferred thickness.
8. Garnish: Remove from heat and garnish with sesame seeds and sliced green onions for added flavor and a pop of color.
9. Serve: Serve your Beef Stir-Fry hot over a bed of cooked rice or noodles.

These steps will guide you in creating a stunning dish that is sure to impress your family and friends!