The Silver Spoon Café
This place is REALLY good.
It's slightly more expensive than other western restaurants, but then the quality of the food also seems better too.
The dining area is small, but the design is very stylish and very western.
The Chipotle salad with chicken is GREAT and the desserts also looked pretty amazing.
If I could only eat at one western food place in Kunming, this would probably be the place I'd pick based on the food and the atmosphere.