Nature's Vegetarian Restaurant in Bangsar is a very nice Chinese Vegetarian Restaurant with many vegan options.
They do not have a separate menu for vegans, but staff know which of their products contain dairy products or egg. (Better not order mock meat if you are vegan as this often also can contain animal products like egg or whey, and is possibly not immdediately obvious for the staff).
If you come there before 18:00 hours, they have also a very nice Dim Sum menu with many delicious options.
Taste of the food is delicious, and most of the food also looks healthy - they do not have too many deep-fried options, but offer many plant-based chinese dishes.
Prices are moderate, and definitely ok for the central location. It is located just a few meters up the road from Bangsar Village 2, which is also normally one of the best places to park the car (finding a parking spot in Bangsar is normally a challenge).
Cons: Vegan options not marked, Parking can be a challenge