In a bowl, combine the thinly sliced beef with a pinch of salt, a few cracks of black pepper, and 1 tablespoon of soy sauce. Mix well and let it marinate for approximately 15 minutes.
Heat a large skillet or wok over medium-high heat. Add 1 tablespoon of vegetable oil, allowing it to heat up until shimmering. Carefully place the marinated beef in a single layer without overcrowding. Sear for about 2-3 minutes or until the pieces are crispy and a rich brown color. Once cooked, remove the beef from the skillet and set aside.
In the same skillet, add another tablespoon of vegetable oil. Once hot, add the minced garlic and sauté for about 30 seconds until fragrant. Next, introduce the diced bell pepper and carrot to the skillet. Stir-fry for approximately 3-4 minutes, ensuring the vegetables remain tender yet slightly crisp.
Add the chilled cooked jasmine rice to the skillet, using a spatula to break apart any clumped rice grains. Pour in the remaining soy sauce, oyster sauce (if using), chili paste, and sesame oil. Toss everything together vigorously until the rice is well-coated with the sauces and heated through.
Return the crispy beef to the skillet, and thoroughly mix it into the rice and vegetables. Continue stir-frying for an additional 2-3 minutes to blend all the flavors beautifully.
Remove the skillet from the heat and gently fold in the chopped green onions.
Spoon the crispy chili beef fried rice into plates or bowls, ensuring an even distribution of beef, vegetables, and rice.