I don't know where this recipe came from, but my mother made it when I was growing up. I have added a little kick of heat by adding cayenne, but otherwise it is the same one she made. I serve it over rice or noodles and we love it. It is a quick meal if you have frozen meatballs to use. Frozen meatballs aren't quite the same as the homemade variety, but they work in a pinch.
Beat egg slightly, add milk, bread crumbs, grated onion, salt, dry mustard, celery salt, pepper, nutmeg, and ground beef. Mix thoroughly. Shape into small balls using one teaspoon for each ball. Roll lightly in flour. Brown in oil.
Push meatballs to outside of skillet and add mixed vegetables. Dilute mushroom soup with milk and add to the meat and vegetables. Add cayenne to taste. Simmer for 10 minutes.