Creating Crispy Chilli Beef Rice is a straightforward process. Follow these steps to ensure success:

1. Marinate the Beef: In a bowl, combine the thinly sliced beef with soy sauce, salt, and pepper. Let it marinate for about 15 minutes.
2. Prepare the Rice: Cook the rice according to package instructions. Once done, set it aside and keep it warm.
3. Coat the Beef: Toss the marinated beef slices in cornstarch until evenly coated. This will help achieve the crispy texture.
4. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat.
5. Cook the Beef: Add the coated beef to the hot oil in batches. Fry until golden brown and crispy, about 3-4 minutes per side. Remove and set aside.
6. Sauté the Vegetables: In the same skillet, add the sliced onion, bell peppers, garlic, and ginger. Stir-fry for 3-4 minutes until the vegetables are tender.
7. Combine Sauce: Add the crispy beef back into the skillet. Pour in sweet chili sauce and chili flakes, stirring to combine everything evenly.
8. Mix with Rice: Add the cooked rice to the skillet, tossing everything together to ensure the rice is coated with the sauce and flavors.
9. Adjust Seasoning: Taste and adjust seasoning with additional soy sauce, salt, or chili flakes if desired.
10. Serve Hot: Remove from heat and garnish with chopped green onions and sesame seeds.

These steps will guide you in creating an incredible Crispy Chilli Beef Rice that is sure to leave your guests wanting more.