I made this meatball pasta bake at home several times during lockdown. It was a great family recipe to rediscover. It has a nice Italian influence, but the key is good, quality-assured mince with the Bord Bia logo. The pork adds nice moisture and texture.
You could use breadcrumbs instead of crackers. Use any pasta shells you like. Simply Better make a very good passata with tomatoes from Puglia. For mozzarella, there is the fabulous Toonsbridge Dairy in Macroom, which I have had the pleasure to visit. Not only can you find them online, but they now have a shop in South Great Georges Street in Dublin.