Cook noodles according to package, then rinse well.
Combine sesame oil, vegetable oil, onion, pepper, ginger & soy sauce in a large sauce pan. Cook over medium-low heat for 10 minutes until the onion is soft, then stir in the broth & beans. Bring gently to a boil, then add the carrots & mushrooms. Continue cooking for 2-3 minutes, then add the bok choy & cooked noodles. Continue simmering for 1-2 minutes. Remove from heat and add miso & scallions. Serve immediately.
Serves 4