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.
A simple swap is all it takes to reimagine panzanella. This Italian summer salad usually features cubes of day-old rustic bread and tomatoes, tossed with basil leaves and a simple vinaigrette. But slices of ripe, juicy peaches in place of, or in addition to, the tomatoes bring a different (but entirely welcome) sweetness to the mix.