This recipe was originally shared with me by a dear friend. So tasty as well as being an easy alternative to the traditional handmade Pierogies. While this is not difficult, it is a multi-step recipe. (1) cook pasta shells (2) potato preparation and cooking (3) potato mashing (4) onion slicing and cooking (5) stuffing pasta shells (6) layering onions and shells (7) baking. Cooking and preparation times are approximate.