2Meanwhile, in medium bowl, beat egg. Add sour cream, Parm cheese, and garlic powder.
3Drain spaghetti; add to egg mixture, then add Jack cheese, spinach, and half of French fried onions.
4Pour into a greased 2 qt. baking dish. Cover and bake at 350 degrees for 30 minutes, or until heated through. Top with remaining French fried onions and bake 5 minutes longer, or until onions are golden brown.