If you've got a bit home sickness & are tired of Nepali cuisine, Thamel is the place to go. It is probably the most westernized place you will find in Nepal. Two of my favorite western restaurants are right across the street from each other.
The Fire & Ice Pizzeria has some of the best pizza you will find in Thamel. It's located at the "entrance" of Thamel where all the taxis hang out & where they usually will drop you off at. It's on the side of the street that has the temple buildings. You can get ham, chicken, tomato, cheese & different veggies but as you are in a Hindu country, no beef, but thats no big loss. I never had any but I believe they also serve spaghetti & some other pastas. They also have some great soft serve ice cream. For about $5-6 you can have your own pizza (about 14"), a soft drink & some ice cream & still be able to leave tip.
Just across the street & up some stairs is a place called Himalayan Java, a very western coffee house, that serves a variety of soups, some wraps, sandwiches, appetizers & some local dishes & also desserts. I don't care much for coffee but my friends told me that it was really good. Being a western restaurant, be prepared to pay more western prices, especially if you get a whole spread.