My good friend is about to have her 4th baby, and being a practical person, she refused a shower and asked for meals for her freezer. So I need to come up with a good meal I can put in a foil casserole dish and freeze! Somebody’s got to have a good idea, right? Help me out here, 'cause all I can think of is vegetarian lentil stew and I don’t think her kids will love me if I do that. 
Lasagna always works really well in the freezer. So does meatloaf (put mashed potatoes over the top for something approximating a real meal).
A casserole dish full of ice cream should be a big hit.
Shepherd’s pie.
Mild curries.
Daal.
A load of frozen mashed potato - not a meal in itself, but very useful for lots of other meals.
Nut roast, as long as you have a good recipe.
Argh, I totally thought I was posting in CS. Now I have to report myself to move it!
Thanks guys, keep 'em coming.
Chicken pot pie filling. Quick and easy to prepare by pouring into a store-bought pie crust or dumped into a pan topped with biscuits from a can.
Enchiladas! I don’t know how to make enough for just one, so I always make at least two pans and freeze the ones I don’t eat right away.
The recipe is simple; the sauce is 2 large cans cream of mushroom soup, two or three pounds chicken or beef, a large onion, some fresh garlic, and a bag of green chile (NOT optional!). Cook the meat and then add the onions, then the garlic, and finally the cream soup. A small can of nacho cheese is optional if you’re feeling cheesy.
You can fit about three layers in a 2" pan, first corn tortillas, then the sauce, then the cheese. It couldn’t be simpler, and I get so many compliments on it. Good stuff!
Do you mean a sort of enchilada lasagna, not rolled-up enchiladas?
Missed the edit window…
That was a fun game!!!
EETA: I believe it’s technically called an enchilada casserole, but yes, it’s very similar to lasagna; it just has a different grain and a different sauce. They’re equally awesome.
Off to Cafe Society.
Almost any kind of stew - vegetarian or not - freezes well (no lentils necessary, though personally I love them).
Chilli freezes well in my experience.
My MIL made tamales for us; they were fantastic, since you can defrost exactly the right amount for a meal.
Does it have to be something in a casserole dish? If not:
Soup. You can make a huge amount as easily as a few bowls worth and freeze it in quart containers.
Tomato sauce. Same idea as soup, it only requires the end-user to boil some pasta.
Stuffed peppers. Cook up some rice or barley and add it to cooked onion, garlic, ground meat (turkey works), a little tomato sauce, maybe some spinach, or mushrooms, perhaps some cheese. Dump it into raw bell peppers wrap in plastic + foil and freeze. Straight from the freezer to a casserole dish (there it is) into a 350 degree oven for about an hour to thaw everything and cook the peppers through.
Stuffed pork chops.
And, stuffed chicken breast, or, chicken roll ups (with ham and cheese).
Chili.
Beef bourguinone.
spaghetti sauce.
pot roast (sliced and immersed in the cooking liquid).
You want to make it really really user friendly, you can pour it over the boiled noodles and freeze the whole thing. Fresh noodles would clearly be less soggy, but having it truly ready made makes for little to no fuss, and IME, the finished product thaws pretty well.
And if you undercook the noodles by about 10% and she bakes it from froze, it’ll come out perfectly.
I’d freeze the sauce and noodles together. As little work as possible. Also, I recommend penne or rigatoni or something- it’s easier to eat with one hand. Spaghetti’s difficult.
Any kind of lasagna freezes well.
Muffins. Any kind of muffins.
Stew, or a big container of pot roast in gravy, and a big container of mashed potatoes. Cook veg with the pot roast- carrots, onions, celery.
Ditto chili, although maybe it should be mild, not spicy- some babies have trouble with Mom eating spicy things.
Cooked, shredded chicken, maybe? For dumping on salad, making sandwiches and tacos?
Frozen garlic bread and a big pot of minestrone.
Okay, I’ll go now.
Make her a chocolate cake. A big one.