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.
Things that are grown-up: tea in a porcelain cup, making to-do lists, effectively using sticky notes, and using matching pot holders. Things that are not grown-up: microwavable mac and cheese. See also: mac and cheese from a pouch and macaroni with cold peels of shredded American cheese. For when you're too sophisticated for mac and cheese but not quite over the cozy-comfort-delicious factor, these recipes should do the trick.