Prepare noodles according to instructions on package and set aside. (You can do this while you are cooking the other ingredients.)
Saute onions until caramelized. Set aside in large Mixing Bowl.
Saute chicken (may use the same pan in which you cooked the onions) with soy sauce and mirin. When chicken is partially cooked, add shrimp, 1 cup of mung bean sprouts (they will cook down-- this is a great way to hide more veggies for the kids), and mushrooms.
When mushrooms start to soften, remove all ingredients from pan and add to large mixing bowl with the sautéed onions.
Scramble eggs and add to mixing bowl.
Add noodles, green onions, remaining cup of mung bean sprouts, and sauce. Stir until ingredients are well-combined.
Add cilantro and nuts to garnish