Slice chicken into strips and mix with soy sauce and baking soda. Set aside.
In a small bowl, mix tamarind paste, palm sugar, and fish sauce until combined.
Heat oil in a pan and cook tofu until golden. Remove or set aside.
Add shallots and cook until soft. Add chicken and cook until nearly done.
Push everything aside, crack in the egg, and scramble.
Mix together, then add noodles and sauce. Stir on high heat.
Add water if needed and cook until noodles slightly caramelize.
Toss in bean sprouts, chives, peanuts, and chili flakes. Serve hot.