Vegan Bodybuilding & Fitness

I LOVE peanut butter and banana sandwiches. I was reading a news story about Elvis today (it would have been his 75th birthday recently) and saw that he too loved them but liked them fried. This sounded really good to me so I looked up the recipe which is just like a normal pb and banana sandwich but you put butter on either side at the end and fry it in a pan. Does anyone know what I could use instead of butter to fry the sandwich? Obviously something vegan and as healthy as possible.

Thanks!!!

Margarine?

Olive Oil?

Earth Balance?