Preheat oven to 350 degrees. Saute vegetables in butter over medium heat. Add 1/2 teaspoon of salt to the vegetables. When the onions are translucent and the remaining vegetables are soft turn off the heat. Combine in a bowl ground chuck, 2 beaten eggs, milk, vegetables, and seasoned bread crumbs to the bowl. Stir to mix well. Add salt and pepper to meatloaf mixture and blend seasonings in well.
Pat meatloaf into a greased loaf pan. Bake for 60 minutes. Remove meatloaf from oven. Add ketchup to the top of the meatloaf and spread out evenly. Bake for another 15 minutes so the ketchup caramelizes on the top.