Agreed, no soups or casseroles. No steak either: too easy to mess up.
I'd do a quiche myself. Buy pie crust, but not the kind in a foil pan. That's funky, and the wrong dish. Use a quiche pan or a tart pan. I prefer a loose bottomed tart pan, non-stick. About $5 from Williams-Sonoma (one of the few non-obscenely overpriced things they sell), less than the cost of one steak, so no problem with buying equipment for one meal.
Pre-bake the pie crust. You do this by putting it in the pan, lining it with parchment paper aka heavy duty tissue paper, and filling the paper with dried beans. This keeps the crust from ballooning up.
Once that is done the rest is ludicrously easy. Cream, half-and-half, or milk, as you prefer, and eggs, with salt and pepper. About 1/4 cup milk per egg. How much you need depends on how much stuff you want to put in. Stuff: I like to make it with smoked fish, salmon or mackeral. I think I'm the only person on the planet who makes fish quiche, but every time I make it it disappears ridiculously fast, so it can't be that bad. Non-smoked salmon works too, but high quality stuff, no pale farm-raised crap. Potatoes and bacon are good, layered with cheese, if you use waxy golden potatoes, not russets of idahos. You want something more vegetable-y and less starchy. Broccoli is classic, if a little boring. Mushrooms are awesome, especially if you can get some good varieties--mixed mushrooms are good. In season, asparagus is good, but it's not in season, so never mind. For spinach or broccoli I like to make sure I cut or chop it up pretty small so that when you slice the quiche it doesn't fall apart. Sautee the stuff--butter or olive oil, depending on what you're using, let it cool a bit, pour it in the egg stuff. Layer some cheese in the crust, which kind depends on the filling, but parmesan or romano usually works, pour the filling in, bake around 400 until it's set. How long depends on how deep of a pan you're using. Sometimes I sprinkle a little grated parmesan on the top as it's finishing up, especially if I'm using mushrooms or spinach. Fish doesn't really need cheese.
Get some white wine. Good side dishes: couscous, squash, mashed sweet potatoes.