Dude, I'm no chef but I've found some quick things that get good reviews.
Tilapia & blackening seasoning. Just put some on there and then fry it in a skillert for like 4 minutes or so on each side. Quick, easy, and don't try it on a first date because quite a few people dislike fish in general =) I usually just have some kind of rice with it and maybe a 1/3 of a salad.
Tortolina. This one takes no effort at all. Dump it in boiling water for a few minutes, just don't overcook it, and then add some Vodka pasta sauce (the orange crap). I use the 3 cheese torts, not the pork or chicken which look weird on the inside. I usually have salad and whatever the tastiest bread I can find locally. Lobster stuffed torts or rav also work the same.
The main thing that seems to matter is don't let her see the twist off wine bottle & make the food look elegantly laid out & such. They won't know the difference.
There are a few others I use but they take more preparation. These take less than 15 minutes and anyone could pull it off.