the liquid and adjust the seasoning if needed, keeping in mind the Parmesan will add saltiness as it bakes.
Slowly pour the cream-and-broth mixture over the pasta and peas in the ceramic baking dish, making sure the liquid seeps down through the shells. Gently nudge any exposed pasta down so most of it is at least partially submerged; a few pieces peeking out are fine and will brown slightly.
Cover the baking dish tightly with foil to trap in steam, which helps the shells cook evenly. Place the dish on
