I used to say nothing, but it all depends on the type of house and the kind of buyer you’re aiming at. Previously I’d say most people would probably be planning to rip out a kitchen and put in one to their taste, but I think lots of folk simply can’t be arsed and want to buy a house with a high-end kitchen already in place.
So it may be worthwhile putting in a decent kitchen, but you may not get the whole value back, just make it easier to shift in a buyer’s market. And if you’re in a streetful of similarly priced houses, a new kitchen won’t boost it over that threshold.
One thing I wouldn’t do it put in a low-end budget kitchen. Or do anything outlandish like alternating black and white tiles or lime green splashbacks etc.