Courtesy of Oh She Glows, Creamy Avocado Pasta. You will never miss cheese or butter again! I halved the recipe (as I was cooking for one!) and it tasted great! Could have used a bit more garlic, maybe some cilantro; will be perfect next time!
http://ohsheglows.com/2011/01/31/15-minute-creamy-avocado-pasta/
I have GOT to try this. I keep seeing it pop up on Pinterest!