I make a sausage/cabbage casserole with layers of cabbage w?S7P, slices of baked potatoes, sausage, repeat all three layers, then make a white sauce, add some yellow mustard when it starts to thicken and pour over top - sprinkle paprika and bake at 350 for 45min to an hour till browned.
Can also do an eggplant or zucchini casserole, layer of stuffing mix, eggplant, chopped tomato, onion, italian seasoning and sausage, repeat layers, top with mozzarella cheese and some cheddar and bake for an hour at 350 - can use zucchini instead of eggplant - both are awesome.
I use uncooked sausage for each of these but I don't see why precooked would not work - can add some garlic as well to taste.