Here are a few of my family's favorite casseroles. Some I make as written, some I add more spices to. I have found a lot of casseroles to be pretty bland the first go-round. I wondered about that and then though that often, casseroles are give-away meals, so I guess the flavors have to be milder. If you try any of these, go with the recipe the first time and then "doctor it up" to suit your family's tastes.
King Ranch Chicken ( I prefer the non-condensed soup version, but either one is really good)
Cheesy Pasta Casserole
Chicken enchiladas are a freezer staple in our house. I use this sauce recipe.
Cavatini pasta with meat sauce (I add fresh garlic to this and usually double the spices)
Chicken pot pie is another freezer staple.
BBQ Beef and Bean Casserole