Blend cream cheese, eggs, milk, yogurt, cottage cheese, mustard, and sage in blender until smooth. Pour over bread in baking pan. Top with remaining Parmesan cheese and green onions.
3 Cover with plastic wrap and refrigerate overnight. Remove from refrigerator 30 minutes before baking.
4 Preheat oven to 350 degrees. Remove plastic wrap from baking dish and bake uncovered an hour or more until center is set.