Precook manicotti in boiling water until partially softened (about 5 minutes), drain. Mix hazelnuts, spinach, cottage cheese, onions, seasonings and eggs; fill manicotti. Cover bottom of a 2-quart baking dish with one cup spaghetti sauce. Arrange filled manicotti in a single layer in baking dish, allowing space between each for expansion during cooking. Cover with remaining sauce. Cover dish and bake at 375 for 40-45 minutes. Allow 1 or 2 per person.
