I use lean ground beef and add a small grated onion ( or half a larger one) 1 beaten egg, 1/4 cup Heinz ketchup and enough fine bread crumbs to make a nice loaf. After the loaf is in the oven container I mix a little water with another 1/4 cup ketchup to cover the top and bake.
I like my meatloaf fairly solid so leftovers can be sliced the next day for sandwiches.