This also happens to be one of my favorite sandwiches: Peanut Butter & Banana. I added a little cinnamon and put it all on toasted wheat and let it heat up in the broiler. I used my grocery store's generic brand peanut butter ($1.50); the banana was 17¢ and I only used half of it so I still have 8.5¢ worth of banana to invest in high interest mortgages or whatever. Call me, Wall Street. We'll talk.
(As you can see, I also ate some apples with more peanut butter, because whatever, I'll throw my money around into all kinds of produce to use as vehicles for peanut butter, I don't even care.)