Cook shells according to package directions, rinse and drain well. (You can do this while preparing the spaghetti sauce, below.)

Preheat oven to 350 degrees Fahrenheit. Spoon three-fourths cup spaghetti sauce into the bottoms of two 9×13 pans.

In a large bowl, combine ricotta or cottage cheese, mozzarella, eggs, bread crumbs, parsley, salt and pepper. Stuff a rounded tablespoonful of cheese mixture into each shell. Place shells on top of sauce in pans, seam side down, in a single layer. Spoon additional sauce over shells and sprinkle with Parmesan cheese. Bake in preheated oven for 30 minutes, uncovered.

Heat oil in a medium saucepan over medium heat. Add onion and garlic and cook until tender, about ten minutes. Add all remaining ingredients and heat to boiling.

Reduce heat to medium-low, partially cover and cook 30 minutes.

Discard bay leaf before using. This sauce works great with any pasta, eggs, grilled cheese etc.