Prepare noodles – Soak rice noodles in warm water for 30–40 minutes until pliable but not mushy. Drain and set aside.
Mix sauce – In a small bowl, whisk together tamarind paste, fish sauce, oyster sauce, sugar, and chili flakes.
Cook protein – Heat 1 tbsp oil in a wok or pan, stir-fry chicken/shrimp/tofu until cooked through. Remove and set aside.
Scramble eggs – Add a little more oil, crack eggs, and scramble lightly. Push to one side of the pan.
Add noodles & sauce – Toss in drained noodles, pour the sauce over, and stir-fry until noodles absorb the flavor (2–3 minutes).
Combine – Add cooked protein back, along with bean sprouts and green onions. Stir-fry briefly.
Serve – Plate hot, top with crushed peanuts, extra chili, and lime wedges on the side.