1. Soak rice noodles in a bowl of lukewarm water for 10 minutes.
2. Meanwhile, brown beef in a large nonstick skillet over medium-high heat, breaking apart with a spoon, 5 minutes. Pour into colander to drain.
3. Return skillet to medium heat and add scallions and garlic. Saute 1 minute. Add soaked noodles, lime juice, fish sauce, vinegar and sugar. Cook, stirring, 1 minute.
4. Push noodle mixture to one side of skillet and crack eggs into skillet. Scramble eggs, cooking 1 minute. Fold eggs and reserved ground beef into noodle mixture. Add 1/3 cup of the bean sprouts and cook 1 to 2 minutes, until noodles are tender and beef is heated through. Add 1/4 to 1/2 cup water if mixture is too dry. Transfer to a serving platter and top with remaining 1/3 cup sprouts and peanuts. Serve with lime wedges.