Prep Time 25 minutes mins
Cook Time 25 minutes mins
Total Time 50 minutes mins
Don't skip the salting step - it is what keeps the shells firm. Keep the hollows to a 1/4-inch wall; scooping too deep makes the boats floppy. Check at 20 minutes: the filling should be bubbly and the shells tender but still holding their shape. To make ahead, assemble the raw boats, cover, and refrigerate for up to 2 days, or freeze unbaked for up to 2 months. Reheat leftovers in a 350°F oven, not the microwave, so the shells stay firm. For a dairy-free version, use dairy-free mozzarella and skip the Parmesan or swap in nutritional yeast.