Yes, you can. You can either leave in the refrigerator and bake prior to serving (you will probably need to add a few minutes to baking time if you’re transferring straight from refrigerator to oven), or you can fully bake and then just heat up in the oven.
3. Cover with aluminum foil and bake for 30 minutes. Remove the casserole from the oven, raise the temperature to 400 degrees, sprinkle some cheddar cheese on top and bake for 10 more minutes.