In a large bowl, beat eggs, milk, catsup, salt and pepper. Add beef and mix
well. Pat half of the meat mixture into a greased 9 x 5-inch loaf pan; set
aside.
For stuffing, sauté the mushrooms and onion in butter until tender, about 3
minutes. Add bread crumbs, parsley, thyme, salt and pepper; sauté until crumbs
are lightly browned. Spoon over meat layer; cover with remaining meat mixture
and press down gently. Bake at 350 degrees F for 1 hour or until no pink
remains, draining fat when necessary.