Soak rice noodles in a container with hot water for 10 minutes until barely soft. Drain and rinse with cold water to remove excessive starch. Drain.
Combine fish sauce, tamarind concentrate, sugar, lime juice, and 2 tablespoon water in a small bowl.
Heat vegetable oil in a large non-stick fry pan. Sauté garlic for 1 minute. Sprinkle pepper onto chicken breast and add it to the pan. Cook for 2 minutes.
Add shrimps and sliced red chilies. Cook for 2 minutes. Crack in the egg. Stir to break up the yolk and cook for 1 minute.
Add rice noodles and soy mixture. Stir to get all ingredients well mixed, about 3 to 4 minutes.
Add bean sprouts. Stir for another minute. Turn off heat. Sprinkle with chopped peanuts and green onions.
Dish onto plates and serve immediately with lime wedges.