Start by marinating the sliced beef. In a bowl, combine soy sauce, cornstarch, and a pinch of salt and pepper. Add the beef slices, mix well, and let it marinate for at least 30 minutes.
Cook the jasmine rice according to package instructions. Set aside and keep warm.
In a large skillet or wok, heat the vegetable oil over high heat. Add the marinated beef slices in a single layer and fry until crispy and browned, about 3-4 minutes. Remove from the skillet and set aside.
In the same skillet, add the minced garlic and ginger, and sauté for about 30 seconds until fragrant.
Add the sliced red and green bell peppers to the skillet and stir-fry for 2-3 minutes until they begin to soften.
Stir in the crispy beef and the chili paste, mixing everything together for another 2 minutes. Drizzle sesame oil over the mixture and toss to combine.
Serve the crispy chili beef over a bed of jasmine rice, and garnish with chopped spring onions and fresh cilantro leaves.