Adding toasted whole-wheat breadcrumbs gives this dish a nice crunch that balances out the creaminess of the sauce. Rather than baking the shells with the crumbs on top (which can make them soggy), toast the breadcrumbs separately, and toss a handful over each serving right before you put it on the table.
The sweet, fibrous flesh of autumn pumpkins just begs to be roasted. Nutritionally speaking, they're hard to beat, topping the list of superfoods with plenty of protein, fiber, vitamin C, potassium, and beta-carotene. Plus, they're low in calories (just 49 per cup), making them the perfect anchor for a hearty pasta dish with anchovies and toasted walnuts.