Slice the onion and mushroom, set aside. Cutthe chives to 1 cm lengths.
In a small bowl, mix the yakisoba sauce and heavy cream. Set aside.
Using a frying pan, grill the store-bought smoked spicy chicken sausage. Once the sausage is thoroughly cooked, cut to bite sized pieces. One sausage is going to be served with yakisoba, and the other sausage will be a side dish.
Heat a separate pan and add in butter, onions, and mushrooms. Season with salt and pepper, sauté.
After the onions are cooked, add in the yakisoba noodles, following the package instructions to add water and loosen the noodles. Stir the noodles with the onions and mushrooms. After the noodles are cooked, add in the sauce from step 2 and add in the chives. Stir well.
Place the yakisoba in a plate and place the sausage next to the yakisoba. Lastly, top with chives and you are done!