Do you cover tuna noodle casserole when baking?

Here's why:

* The casserole needs to brown: The top needs to brown nicely for that classic tuna noodle casserole look and flavor. Covering it would prevent this.

* Moisture is already present: The canned tuna, noodles, and sauce provide enough moisture to cook the casserole through.

However, if you're concerned about the casserole drying out, you can:

* Sprinkle cheese on top: This helps create a nice, melty crust.

* Add a bit more sauce: Ensure there's enough liquid to keep the casserole moist.

Ultimately, it's up to your personal preference! If you like a crispy top, leave it uncovered. If you prefer a softer texture, you can briefly cover it during the first part of baking.