In a bowl, lightly beat the eggs; add bread crumbs, ketchup, milk, 1/2 teaspoon salt, pepper and oregano. Add beef and mix well. On a large piece of heavy-duty foil, pat beef mixture into a 12x10-in. rectangle. Cover with spinach to within 1/2-in. of edges. Sprinkle with remaining salt. Top with ham and 1-1/2 cups cheese. Roll up jelly-roll style, starting with a short side and peeling foil away while rolling. Seal seam and ends; place with seam side down in a greased 15x10x1-in. baking pan. Bake, uncovered, at 350° for 1 hour and 10 minutes. Top with remaining cheese; bake 5 minutes longer or until cheese is melted.