Preheat oven to 200°C (180°C fan forced) and line a baking tray with baking paper.
Place cold cooked rice in a bowl and break up any clumps. Add vegetable oil, soy sauce, and fish sauce. Toss until the rice coats evenly.
Spread the rice across the tray in a thin layer. Bake for 30 to 35 minutes, stirring once halfway through, until golden and crisp.
While the rice cooks, whisk fish sauce, lime juice, brown sugar, garlic, ginger, and sesame oil in a small bowl.
Place cucumber, spring onions, coriander, mint, peanuts, and chilli in a large bowl.
Add the warm crispy rice and pour the dressing over the salad. Toss gently until everything mixes well.
Garnish with extra chopped peanuts and serve immediately with lime wedges, while the rice stays crunchy.