Boil enough water to cover noodles. Pour boiling water over noodles, and let sit, stirring occasionally until noodles are softened but still very chewey/al dente, about 6 minutes
Heat 2 tbsp oil in wok over medium heat. When hot, add tofu and fry until lightly golden. You'll want to keep the tofu moving so that it doesn't stick
Add protein, cook until just cooked through
Add garlic, stir fry for a few seconds until fragrant
Crank heat to high. Crack egg into wok, scramble with contents
Remove contents of wok and set aside
Turn wok heat down to medium-high. Add noodles and sauce mixture (oyster sauce, fish sauce, tamarind concentrate, water). Cook until sauce is somewhat reduced noodles are tender but not overdone
Toss egg mixture back into wok. Remove from heat. Season with chili powder to taste. Toss in peanuts, bean sprouts, and chives.