Step 1: Prepare the Beef

1. In a bowl, toss the thinly sliced beef with 1 tablespoon of cornstarch. This helps create a tender texture and a light crust when cooked.
2. Set aside while you prepare the other ingredients.

Step 2: Cook the Ramen Noodles

1. Boil a pot of water and cook the ramen noodles according to the package instructions (usually 2–3 minutes).
2. Drain and rinse under cold water to prevent sticking. Set aside.

Step 3: Make the Sauce

1. In a small bowl, whisk together soy sauce, hoisin sauce, oyster sauce (if using), brown sugar, sesame oil, red pepper flakes, and rice vinegar.
2. Set aside for later.

Step 4: Sear the Beef

1. Heat 1 tablespoon of vegetable oil in a large skillet or wok over high heat.
2. Add the beef slices in a single layer and sear for 1–2 minutes per side until browned but still tender.
3. Remove the beef from the pan and set aside.

Step 5: Stir-Fry the Vegetables

1. In the same pan, add 1 tablespoon of oil and sauté the garlic and ginger for 30 seconds until fragrant.
2. Add the sliced bell peppers, shredded carrots, and green onions, cooking for 2–3 minutes until slightly tender but still crisp.

Step 6: Combine Everything

1. Return the cooked beef to the skillet.
2. Add the cooked ramen noodles, then pour in the prepared sauce.
3. Toss everything together for 1–2 minutes, ensuring the noodles are well-coated with the sauce and the beef is heated through.

Step 7: Serve and Garnish

1. Remove from heat and sprinkle with sesame seeds and extra green onions.
2. Serve immediately and enjoy your homemade beef ramen noodles!