Beat eggs in a large bowl.
Add milk, bread crumbs, onion salt and sage and mix well.
Crumble ground meat into mixture and mix well.
Form into a loaf to sit in the middle of your slow cooker.
Peel potatoes and carrots; cut into 1" chunks and place around meat loaf.
Cook on low 5-6 hours.
Mix together ketchup, brown sugar, mustard and Worcestershire.
Spread sauce on top of meat loaf and cook for 30 minutes on high.