In lightly buttered 9 inchx13 inch baking dish, toss together cooked pasta, turkey, tomatoes, cottage cheese, cheddar, green onions, marjoram and pepper. Sprinkle crumbs on top, dot with butter. (Casserole may be prepared up this point, covered and refrigerated for up to 4 hours.) Bake at 180ºC till casserole is bubbling and top is lightly browned, about 30 minutes.